Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbd2a0b28a329b7…

MALICIOUS

PDF

88.4 KB Created: 2021-03-13 18:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d8351c5e821726c39633974c71075153 SHA-1: 4694418d69e35121c1ab66b18b6ac308d5561c6e SHA-256: 3bbd2a0b28a329b791122505d5b6822d7f25c189ba0cdde3a8e25c8320c5a727
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external URLs, some of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this malicious intent. No scripts were extracted, but the overall structure and URL patterns indicate a phishing attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/123?utm_term=arcaea+apk+free PDF link annotation
    • https://cdn.sqhk.co/pamomusemida/hhgiKhb/98087995084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_5fd85af00e8ca.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/58359597807.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/e5b7d2ef6.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/jjkGric/merge_dragons_cheats_challenge_19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_603e8b5e3db0a.pdfIn PDF document text
    • https://makifilibavik.weebly.com/uploads/1/3/5/3/135383918/b2d70af094.pdfIn PDF document text
    • https://kagoxikefo.weebly.com/uploads/1/3/4/6/134649289/3931718.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/hgfehjK/arcade_fire_reflektor_snl.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/ifgeEgh/28539942355.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/dokumarep-zovemid-gisopagofibew.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/rFtjfYN/54824830301.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_d015c6661c05474a936b4c1a33585f5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/cervical_cancer_screening_in_malawi.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_df95cd0504f74fa785fe052af8cc8dcb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/pitch_black_imdb_parents_guide.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_98e6c8235a91476aaa4aba1463c33541.pdf?index=trueIn PDF document text
    • http://pigutun.myartsonline.com/14492754362.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_819569446d984b1ebebb7fae180ffb92.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/mandated_reporter_training_requirements_california.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/top_sirloin_steak_on_george_foreman_grill.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_8c76b161fb2341e187f20e287a584d46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mamibis/jph_english_guide_for_class_12.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 4060 bytes
SHA-256: 1f741712a3ca8c2da1da7f810d6068fefd287810cbdb2e48916d68e0e718ff83
font_01_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 4852 bytes
SHA-256: 6949fc285aad33e4f71db96cbf0e85be4a3857429e0eb7f693b68ef5bdd921ae
font_02_sfnt_off00011834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11834 11828 bytes
SHA-256: c31e8f676d3a694c84a1c911a553d8b0d614a6ef80077a7e23dd9b0b03fc43a7
font_03_sfnt_off00013ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECE 16108 bytes
SHA-256: 3b54c425d68997f95831a9a204846f60ea49be803d4ab879d8d3c8663fb8d467

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