Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d81a454ad60584d…

MALICIOUS

PDF

90.8 KB Created: 2021-03-17 17:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c48d495c63ad19af1c639b063ef4b85 SHA-1: 9730a67ed75ce17d967905e800c57ab58d79a7b4 SHA-256: 1d81a454ad60584d0d8a880c4f40562dedc4dbcdb9eda107794eb1521094be53
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many of which are SEO-optimized, suggesting an attempt to drive traffic to malicious or spammy websites. The primary malicious URL identified is https://leonvi.ru/wix?keyword=my+boy+apk.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=my+boy+apk
    • https://cdn.sqhk.co/disumuneriva/fhcSihL/dj_marshmello_mask_spirit_halloween.pdf
    • https://cdn.sqhk.co/jigavozef/lyhcggF/prop_hunt_portable_apk.pdf
    • https://cdn.sqhk.co/fefowofuk/jgiaTgI/85754677566.pdf
    • https://cdn.sqhk.co/wotedimozer/hig6gh5/gaboburogedulexokifapakik.pdf
    • https://cdn.sqhk.co/xavaxonad/4hhihXd/18797156989.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_1ddca82ff07d4621b6c18187be6b5d4b.pdf?index=true
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_02cc4ce2cdb24022b20060a8cb5b995d.pdf?index=true
    • https://s3.amazonaws.com/bezorito/72676362209.pdf
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_e5b5f53755884d5da224c0181dc73d95.pdf?index=true
    • https://s3.amazonaws.com/watajive/jugerapizelufubax.pdf
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_75ed1776c3ee4b4cbfe344ba97502f15.pdf?index=true
    • https://s3.amazonaws.com/zafaronivaj/chat_application_project_report.pdf
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_64e4e7f27aee48ebbb21b9581e0effed.pdf?index=true
    • http://bopagit.rf.gd/74389296140.pdf
    • http://faligesiba.rf.gd/how_to_change_transmission_fluid_ford_ranger.pdf
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_8c0b72dcf5cd4148ab3e1bc1eecdb71f.pdf?index=true
    • http://rebivik.epizy.com/vampire_diaries_book_1_online.pdf
    • http://xexotoj.epizy.com/nelowaropomurakabe.pdf
    • https://s3.amazonaws.com/lorifawuvawot/spoken_english_interview_skills.pdf
    • https://s3.amazonaws.com/sivanira/one_of_us_is_lying_summary.pdf
    • https://s3.amazonaws.com/zabevog/sewironewuzipogusuramefe.pdf
    • http://xovigukesejibem.rf.gd/momokexidijuvakozufa.pdf
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_94868747637642adab692d6073c2a916.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012537.bin
7dce375f3dc34511856e42372535ff88948614bad7d0211eb87049b5cdb124c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 4816 bytes
font_01_sfnt_off000135c5.bin
103a15c65c363ea7aeb88ab49d9f7cd6c1708172e53d0eb8580630e8214d1481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 12096 bytes

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