Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8599faeca5b794…

MALICIOUS

PDF

84.7 KB Created: 2021-06-04 13:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3331ccfbf3723775dd322e830e2fe731 SHA-1: e4b1bb2122bca8ba2dd1418f120f85f46077c05f SHA-256: bc8599faeca5b794a6d4f94ace6686fc8a6c4d9cdd1f1f2e3563378a87811b3b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of an SEO spam or link farm operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a resource for 'GED language arts' to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://oniceh.ru/pbw?utm_term=how+to+pass+ged+language+arts PDF link annotation
    • https://rovonowevon.weebly.com/uploads/1/3/6/0/136051941/wubiruganeto_lositawavuzarik_razamujokilo_xukukeket.pdfIn PDF document text
    • https://dutegonuguval.weebly.com/uploads/1/3/4/3/134310875/lolimagoseduwab.pdfIn PDF document text
    • https://gurawibozogudex.weebly.com/uploads/1/3/0/7/130739732/kigozejuzurik.pdfIn PDF document text
    • https://zusajozaza.weebly.com/uploads/1/3/1/3/131381142/3f4bef0384f.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/336bbde.pdfIn PDF document text
    • https://lewixukulir.weebly.com/uploads/1/3/1/6/131606807/4621136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_606485fb83f43.pdfIn PDF document text
    • https://kugakisan.weebly.com/uploads/1/3/4/3/134390280/durexarovezilez.pdfIn PDF document text
    • https://vusuranozaxo.weebly.com/uploads/1/3/4/0/134012668/6864112.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490377/normal_5ff588d733bb0.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/fodujibomu.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/6348196.pdfIn PDF document text
    • https://vinunawamezod.weebly.com/uploads/1/3/1/3/131380031/07f5c30c2e10d6b.pdfIn PDF document text
    • https://tabikajodunel.weebly.com/uploads/1/3/0/7/130739544/6079767.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/2783079.pdfIn PDF document text
    • https://zakulupibuwuvos.weebly.com/uploads/1/3/4/6/134686441/5ec56a5ffd25cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_602b918f3f1b7.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/1019700.pdfIn PDF document text
    • https://sebumowuvuxeluz.weebly.com/uploads/1/3/5/9/135962316/lisubabotukevex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144424173/bewabusekar.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144444735/pitch_perfect_2_movie_download_in_hindi_480p.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144419007/12417465386.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_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 5180 bytes
SHA-256: 9b2c4d0fcf0f01b00f0bac2635265708571ad4ea58fc95fe50b390340a00b937
font_01_sfnt_off000108f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F6 10944 bytes
SHA-256: ab7300768d401d0d332a93e5826aa978c39ce9603594d4c8ba8e8c11b4dd75e2
font_02_sfnt_off00012e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6B 16480 bytes
SHA-256: b73d99c629815b33c50d9cf51511840d8a098a68666758ce9c975020fc391a69

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