Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47ff1fa9af66758…

MALICIOUS

PDF

76.5 KB Created: 2021-03-18 06:21:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: fa48c535f07c0c3043bcfceb6ed0e7dd SHA-1: 8f18e3b8aba80acdab20300244082ef261897e92 SHA-256: a47ff1fa9af66758cac0aff726b6b702e2f5f80c6dc7c69ff4a492b607a6851f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic confirming the presence of a large number of external links. The embedded URL https://mezovuduw.ru/strik?utm_term=where+she+went is likely a redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=where+she+went PDF link annotation
    • https://pasorizafam.weebly.com/uploads/1/3/4/0/134096756/7598906.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/1545901.pdfIn PDF document text
    • https://tazesudi.weebly.com/uploads/1/3/0/9/130969012/besiguwufaraligikos.pdfIn PDF document text
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/lakexinotuzikuj.pdfIn PDF document text
    • http://labakugolav.iblogger.org/major_themes_in_house_on_mango_street.pdfIn PDF document text
    • https://vilawamilufulob.weebly.com/uploads/1/3/6/0/136006615/fokenedada.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/wapoba-bonudone.pdfIn PDF document text
    • https://bagobizofenagex.weebly.com/uploads/1/3/4/7/134767931/solokuvibudamerimer.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/acc4f0e0-29ef-4ba6-b5ba-c7972e60e54d/4894953915.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/erosional_landforms_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1192b30a-5773-4e5b-8171-3d2d091861f2/92509773154.pdfIn PDF document text
    • http://xawoforusur.epizy.com/rezawumumog.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/can_you_keep_a_secret_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/57820699710.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/58739619424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6627500-cdef-4ed6-80f5-eab2ceb31cc6/how_to_charge_dyson_dc44_animal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f16f7db4-cd62-49a3-9b54-fb85918ef80e/92200859949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d34c9fc-40a2-4d31-a2c4-c33a28226456/339949644.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86d33a0-7141-4b3f-976f-93daf496d8e3/natolovilevadegobami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7fe0594-d17a-45ef-931e-2f757adf29f1/diary_of_a_wimpy_kid_listen_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/bone_dry_crossword_answer.pdfIn PDF document text
    • http://selitesavuweg.epizy.com/what_is_a_romantic_literature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56286478-d5ad-4b0b-8482-e1b81f17a098/what_is_the_hardest_drum_rudiment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a374dd97-2daf-400c-9bcd-514a4fd6ea89/what_is_the_most_popular_love_song_ever.pdfIn PDF document text
    • http://mimarenunev.rf.gd/lukas_graham_7_years_old_lyrics_spiderman.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_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 4636 bytes
SHA-256: 078d7ef2f07ea8a1526916308ed8b06dc5f5854bff32639941c160a2fde99467
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 10472 bytes
SHA-256: 841b7ee17667cc7109629046ebb53b5fb998146b4687875147581566bbfea954

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