Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84394646a4321f8…

MALICIOUS

PDF

81.2 KB Created: 2021-03-30 00:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0d7a6a0d8018d3dde41e9c80eb2d7577 SHA-1: dc141d9eaa8b2c224ce03fb8d84a12a2c39f4118 SHA-256: a84394646a4321f8616b52f84f3c1e9d6314059a5672a32e9b3955b29b4e8d37
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kuzutuzo.ru/wix?keyword=pasco+county+dmv+fl PDF link annotation
    • http://mailedflkf.site/dtu_joint_de_dilatation_mur_de_clotut17ov.pdfIn PDF document text
    • http://usesol.xyz/nunirorapeleleluvosezetot542xt.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/gamufelalemileroged.pdfIn PDF document text
    • https://cdn.sqhk.co/muvifisi/ijd5dKN/fruit_tap_blast_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/J6icor6/free_robux_promo_codes_2020_not_expired_october.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/ch02151/roblox_unblocked_games_88.pdfIn PDF document text
    • https://gopiwalugase.weebly.com/uploads/1/3/0/7/130738825/7633379.pdfIn PDF document text
    • https://vademakab.weebly.com/uploads/1/3/1/3/131380849/4238551.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/bjdgdxR/lidijisejutufigefe.pdfIn PDF document text
    • https://cdn.sqhk.co/tejurorado/jAgctgj/catwoman_2004_movie_free.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/igmjbje/hd_wallpaper_4k_iphone_11_pro_max.pdfIn PDF document text
    • https://cdn.sqhk.co/dikulodut/jcib1eg/96427809621.pdfIn PDF document text
    • https://jibokogemi.weebly.com/uploads/1/3/4/7/134767321/5828659.pdfIn PDF document text
    • http://autolombardpro.ru/the_kiss_of_deception1ek59.pdfIn PDF document text
    • https://fapirezomamu.weebly.com/uploads/1/3/4/3/134382700/nafirib.pdfIn PDF document text
    • https://notovozeje.weebly.com/uploads/1/3/1/3/131379031/636973a6f285.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fetufebutegiv.rf.gd/how_many_calories_are_in_a_bojangles_chicken_biscuit.pdfIn PDF document text
    • http://gegetebipa.atwebpages.com/blues_ukulele.pdfIn PDF document text
    • http://jumezezufa.rf.gd/teradab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 4952 bytes
SHA-256: 62d1c32ea30a9761c6368a15d58838899887b400ab090eaa488e3b6008ba5278
font_01_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 10788 bytes
SHA-256: 9db5857cc061c86a22f64d51f70657d2314debca55adf209ad2562186269ac72
font_02_sfnt_off000129b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B1 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71