Malicious PDF — malware analysis report

Static analysis result for SHA-256 a636e0fa0a8754ed…

MALICIOUS

PDF

80.1 KB Created: 2021-02-22 19:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 184f9512228f6bdc27ef2ec1a8574e95 SHA-1: 51255d08d5deb73ccfa71b8ca8d613465166a513 SHA-256: a636e0fa0a8754ed1e3e589d47ab06dcc857dfc201088026243b61e380fb2ac6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to unrelated content, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://leonvi.ru/aws?utm_term=how+do+you+unlock+a+sharp+carousel+microwave', appears to be a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/aws?utm_term=how+do+you+unlock+a+sharp+carousel+microwave PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386079/normal_5fe295109961c.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/vshOfja/easy_voice_recorder_pro_apk_full.pdfIn PDF document text
    • http://legendbilisim.com/ti_84_calculator_app_for_androidlrovs.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/gifeje5/58104712511.pdfIn PDF document text
    • http://samozanyat.info/airline_industry_in_malaysia8zrjc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fe50924d496a.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/fgcpMgc/download_pocket_arcade_story_dx_mod.pdfIn PDF document text
    • http://universityru.fun/lazoxatu1fzfy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368979/normal_60092e46d583e.pdfIn PDF document text
    • https://fefaxositepimu.weebly.com/uploads/1/3/3/9/133986539/6766699.pdfIn PDF document text
    • https://jopixumux.weebly.com/uploads/1/3/4/7/134734794/nawotepebuvu_pugelitu.pdfIn PDF document text
    • http://fruit-italy.space/free_math_worksheets_odd_and_even_numbersmrptn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/hypertension_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/nespresso_milk_frother_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/centurion_gate_motor_manual_d5_evo.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/97510390396.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 5592 bytes
SHA-256: 1966e1093e728f7e8bf6b4f196a1943a1903d2473eb70391d3ea2c45c13966ed
font_01_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 11184 bytes
SHA-256: ce70d80b1ca59fa3696ccc88fc3de31a811dfb6a63fcf1d58be9c329065ef177
font_02_sfnt_off00011dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFA 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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