Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cea8c799b458486…

MALICIOUS

PDF

81.0 KB Created: 2021-03-26 07:12:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 60ebd7684879bb1f5f15d71ce0b00be6 SHA-1: 5ed153c86b027e8b1589dc8c1da1989048dae49b SHA-256: 4cea8c799b45848635f78ddf759d0e89d0cc196512537180f01c4537f73f2417
186 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. 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 0.9992

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://gimoguvi.ru/strik?utm_term=how+much+does+a+gender+reassignment+surgery+cost PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383928/normal_604b61f07c855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369331/normal_604e5c843b9a8.pdfIn PDF document text
    • https://wetagazikizofab.weebly.com/uploads/1/3/4/5/134590768/gusuxofilusajudu.pdfIn PDF document text
    • https://gidujinogojavu.weebly.com/uploads/1/3/4/0/134096303/zalopav.pdfIn PDF document text
    • https://zelopira.weebly.com/uploads/1/3/5/9/135990333/0c2decd9930770.pdfIn PDF document text
    • http://misstourist.info/how_to_do_a_reverse_search_on_a_picture0d2gs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420599/normal_5ff757de9e955.pdfIn PDF document text
    • https://xojajadajopun.weebly.com/uploads/1/3/4/6/134646320/bolixivala_gubimizufekiso_tumif.pdfIn PDF document text
    • http://sovetnik53.ru/ririkipisijefoyu85o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449788/normal_5fdfd899dfb73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_6028eb1048a26.pdfIn PDF document text
    • http://hardcreditcheck.info/xaritafijoseximirinilityvkl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5aa201c-4f7d-4237-8917-4a33b5e11d96/xesijukapononegojiguro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd09ad15-559d-4994-9045-648e99b0d7eb/external_speakers_not_showing_in_playback_devices_windows_7.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_01ff69e4c84d491da0ac655050b66852.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_ea7584a16b94493e8d0cd00beb89c7e4.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_179fd46317b84a1eadb3e83a026e559c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c50d1b96-837a-4cd1-a5f7-36ffe281ab26/letra_del_himno_nacional_de_honduras_coro_y_solo.pdfIn PDF document text
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_364eb6112e3240d0a27e40ab614ae166.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f81c2c1-623a-408e-9f03-b2ee2d90632c/how_to_get_jump_slash_in_botw.pdfIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_76b84c42ea854a5b9d933b2120b04311.pdf?index=trueIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_ff5902411c2841e28309934289a84cf9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e740e001-f2d0-455a-a9c3-efcc3eac5dc6/best_stock_market_books_for_beginners_in_india.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_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 5476 bytes
SHA-256: a31279bea3f554261a5e3e3eb2bb49848f120c533f9e9d94af8f7de526af8165
font_01_sfnt_off00011012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11012 10988 bytes
SHA-256: cde696b79b428c5f78131ff5774f83e2065c6a9d955090e8894a8e535f5cbc0c