Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc65e4d1f5ec7f2…

MALICIOUS

PDF

74.7 KB Created: 2021-04-28 13:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7468ad7f359412dddde02415528ebdd8 SHA-1: 221659854742d0d5035e64abf262514a3eb4458f SHA-256: ccc65e4d1f5ec7f28db3c3e117e20bf58e3c7fc1a0a6769778a6caef0bc51e6c
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The document body is heavily obfuscated and appears to contain garbled text, but the presence of URLs like 'https://golowaki.ru/strik?utm_term=can%2527t+stop+won%2527t+stop+lyrics+d%2526b+nation' suggests a potential attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=can%2527t+stop+won%2527t+stop+lyrics+d%2526b+nation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389376/normal_5ffbdf59408ad.pdfIn PDF document text
    • http://vorgazme.com/41189427743w02s0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_606220aa05763.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/votakotenibav-rezavateke-xosuge-sekefekexu.pdfIn PDF document text
    • https://cdn.sqhk.co/kawabewiwof/hfhjy1q/instagram_followers_booster_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/XiihMVt/classic_big_keyboard_pro_apk.pdfIn PDF document text
    • https://pomapufawupufus.weebly.com/uploads/1/3/5/3/135397804/223777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_6046878cbd31d.pdfIn PDF document text
    • https://japozinoju.weebly.com/uploads/1/3/4/8/134847937/litewijosesit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_602a0e28dfc53.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/hfrjd9q/vitamin_d3_dosage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_6033baed75ac5.pdfIn PDF document text
    • http://se-mrush.com/gezewecfnwh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_ee67a5f6d52b411fba8903ad2c75853c.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_14663997ce914d73a6f4435b309c1c87.pdf?index=trueIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_a386dae3fae34bb882086e7f18811ffe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/cashmere_cat_princess_cat_girl_album.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/30737095204.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/52452446576.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_f7cce4d967234f9283cf4e4e3b9f0205.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_71c1cee083754be0ac61035bbc417b2b.pdf?index=trueIn 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_off0000e770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE770 5200 bytes
SHA-256: c0870d4674891c7da908fe20ad48f354ca8a3ded8f582a5d42bc84b740af8b23
font_01_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 10552 bytes
SHA-256: 1e869bec885f5ea98cd4bb6d339dbd9b8bf00a53018dd9b320af374cee7b58b8