Malicious PDF — malware analysis report

Static analysis result for SHA-256 459698a82746d043…

MALICIOUS

PDF

85.3 KB Created: 2021-03-30 03:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ad0ee8d6a1de9b869f99352542df358 SHA-1: a764bc44541b7592d7a5b548aded1a33a9e90fb5 SHA-256: 459698a82746d043c83e7a46e6504779788edb0fe6e9fac742fc70274ffd3143
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains. The document body, though heavily obfuscated, contains references to 'Lg wireless headphones hbs 780' and 'wkhtmltopdf', suggesting a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://bologen.ru/strik?utm_term=lg+wireless+headphones+hbs+780
    • https://jufozafofover.weebly.com/uploads/1/3/6/0/136050361/d9ba413dad39d.pdf
    • https://cdn-cms.f-static.net/uploads/4417670/normal_6056f08a91cf8.pdf
    • https://motefeka.weebly.com/uploads/1/3/4/1/134108707/1388774.pdf
    • https://papenuxid.weebly.com/uploads/1/3/0/8/130874395/4903620.pdf
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/1fe5c453a04beb.pdf
    • https://static.s123-cdn-static.com/uploads/4477635/normal_5fdef8a589a8a.pdf
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/jopijaliduvenul.pdf
    • https://cdn-cms.f-static.net/uploads/4376610/normal_604e0f878d962.pdf
    • http://fewomazojuxed.iblogger.org/hall_of_the_mountain_king_violin_sheet.pdf
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/a6e38260a7.pdf
    • http://fomilexavekol.22web.org/13533343304.pdf
    • https://lejuziluzamof.weebly.com/uploads/1/3/4/8/134863123/2e1cb0ed449b.pdf
    • http://joretuvivofip.22web.org/integrated_science_workbook_2b_answer.pdf
    • https://lebiranewedeto.weebly.com/uploads/1/3/4/5/134595514/nifebewuxinit.pdf
    • https://sewetinupas.weebly.com/uploads/1/3/3/9/133997680/betarudiduwisute.pdf
    • https://funefazadoma.weebly.com/uploads/1/3/4/6/134648765/xosirunep.pdf
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/5574228.pdf
    • https://kexizinakit.weebly.com/uploads/1/3/4/8/134870698/wotivoge_losibej_zopujefemenib_gekofolex.pdf
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/mosos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/acc43e07-54c2-4511-bee9-a1cfce583946/lg_g2_hard_reset_with_miracle_box.pdf
    • https://uploads.strikinglycdn.com/files/0054cd5d-af14-47ca-a547-cabbf8b92cbb/human_anatomy_for_artists_the_elements_of_form.pdf
    • https://uploads.strikinglycdn.com/files/38d5956a-885f-48ce-a13d-bbeb2e7afe74/51951586965.pdf
    • http://pesufebavarobi.rf.gd/70183663953.pdf
    • http://lenopebimuzisit.rf.gd/10_000_reasons_lyrics_matt_redman_youtube.pdf
    • 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_off00011048.bin
082a1fba18eb99ee5feb5c793dc789aa64cd14dd0fa925adece36e9d64f3debb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 5808 bytes
font_01_sfnt_off0001241b.bin
f94832590f06386922f1ed65e252dd79c2175b34dc84442825af1ae187e276eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1241B 10504 bytes

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