Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f6d97b6c45dec8…

MALICIOUS

PDF

71.3 KB Created: 2021-04-03 08:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02092a506658ec20760747ad41f0bc3b SHA-1: ca6004a702dddf9122b76db719041e00224d51bb SHA-256: f4f6d97b6c45dec84b25c5c27543dbb1f87ff5b9c04a27c3b9825db756742c56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and forming a link farm, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious campaign.

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 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://static.s123-cdn-static.com/uploads/4490125/normal_5fc86cc6b70cf.pdf In PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/doxujutabof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426690/normal_60311b62877b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426816/normal_5ff4bfc0e3249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5fd2ac7087dba.pdfIn PDF document text
    • http://ital-girl.space/segefugosukej6aut.pdfIn PDF document text
    • https://nonafinawajag.weebly.com/uploads/1/3/4/3/134331790/ruxisiwivopopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455174/normal_600ed8aa112e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5fe468208f35c.pdfIn PDF document text
    • https://fujemolubese.weebly.com/uploads/1/3/4/0/134012375/6691962.pdfIn PDF document text
    • http://umkatrade.ru/zusuzupigejufokacwivh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=technical%20drawing%20pens%20officeworksPDF link annotation
    • https://uploads.strikinglycdn.com/files/3a0a61a8-ed63-4773-b373-0a10cb748145/whirlpool_duet_front_load_washer_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/wood_joints_in_classical_japanese_architecture_di_torashichi_sumiyoshi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7c4b35-1d8a-4311-95d2-fbe846d5571e/descargar_biblia_textual_4ta_edicin.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/whatsapp_install_free_for_android_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc219b59-56b0-4c9d-9635-438a8aa8a473/88245148308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8fb1ec4-ade9-4946-9eee-657b9c359b5f/sobufadojutavag.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 5524 bytes
SHA-256: 39756903c5d5c7008f50db0ac3d9e0f70a245dd4065a2932e2713ed9de1c27f7
font_01_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 10056 bytes
SHA-256: 720ae87207a41f019ff8553bc411ba56b620f14dc9746660eb37737501cca7fd

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