Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85978b3469a3f8a…

MALICIOUS

PDF

73.6 KB Created: 2021-03-27 20:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 00aedd7cab9045e1ea3c407b5d38b172 SHA-1: c7f0fe49276f967cec481ddb8f159696a2204e4d SHA-256: d85978b3469a3f8a8b6d48d1802ef7b360e7253f4a01957a9f90e88a37ed64b7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://dafemum.ru/wix?keyword=crossy+road+hack+android+apk+aptoide PDF link annotation
    • http://xelapelumu.iblogger.org/2969873122.pdfIn PDF document text
    • https://simisodiguguvig.weebly.com/uploads/1/3/5/3/135324772/xodogerusesafi.pdfIn PDF document text
    • https://burakatotofok.weebly.com/uploads/1/3/1/8/131871829/41e5d986327c1f.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/nomevivorigaxob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/76fd889f-f6bc-4f17-a318-2ecb0a4bc9f8/jovinowurepapowizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865a8cdc-b6d2-431d-ad01-d55a3ba6dbd1/how_do_i_charge_my_ue_boom.pdfIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_612c6f6dc32c4ab09564abb9d5439089.pdf?index=trueIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_a475e1f6e3e749778790b64f715b0887.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49931513-97fc-4e99-a78c-22773dda7d6d/can_a_shape_be_both_congruent_and_similar.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/wavelet_transform_of_an_image_matlab_code.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/75769798667.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/chase_bank_levy_department_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/wesof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4bb3bc-f9b7-43d1-b9a4-c0f4d19715ca/inteligencia_emocional_daniel_goleman_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47feb67f-bad8-49ec-bbd7-452cc0a37ec1/the_shack_movie_free_mp4_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4378de83-8fd5-4de3-af53-e951964735a6/hugo_weaving_marvel_movies.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD603 5200 bytes
SHA-256: d6845643ee3f1242cd1b2b75a05db1b6b982da7977f00a3ad53fdc41254f02a5
font_01_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 21628 bytes
SHA-256: d56dbd638e9c955bfac36fedc5c995364ada8023853ca99f717b7555cbb570d4

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