Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85d0f171a0c067d…

MALICIOUS

PDF

80.4 KB Created: 2021-02-15 11:01:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0248789083630f0d0ff6eb90f3ec61bb SHA-1: 9124008a14937fd86d2136ba4f08479fb659c985 SHA-256: d85d0f171a0c067d7013f6f549d164183d41e3f43ac0e08cd3452c493162ee64
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=crossfit+workout+calendar In PDF document text
    • https://cdn.sqhk.co/gewanunu/hfLhjCB/hide_and_seek_online_game_y8.pdfIn PDF document text
    • https://gatilesajegume.weebly.com/uploads/1/3/1/0/131070678/4279951.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/gcjKKG0/ice_cream_roll_maker_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/pidefatop/iiicpgd/chess_tactics_for_beginners_online.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/vFhhR13/54525314165.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/pufopozupad.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/lqgcGjg/66187611711.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/iggf7jg/traditional_kung_fu_training_in_china.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/ijjEidi/96990744796.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/Ehaghfj/powered_hang_glider_price_china.pdfIn PDF document text
    • https://cdn.sqhk.co/wojidumezu/hgd86tr/pitufoxapusura.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/oicjHEd/96451411292.pdfIn PDF document text
    • https://gunagabivap.weebly.com/uploads/1/3/4/8/134863042/wupewobipusaju_kipug_jolum_zavikawuxi.pdfIn PDF document text
    • https://jalusuduzewot.weebly.com/uploads/1/3/1/4/131456012/d3808fd4ad38.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/23398668477.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/25884241760.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/charlotte_s_web_worksheets_free.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_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 5076 bytes
SHA-256: d9bc8cfcba14e1ca1873914ffd8f7f8065ccd69b89651477c3347bdfed1a7d3a
font_01_sfnt_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 5012 bytes
SHA-256: c31d406874f8a77d0554a956aa0403231baf7480bc9482e196dc3ff338e63ede
font_02_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 10412 bytes
SHA-256: a1f227a67ee3a67b282c7fa9c093b5acf6b4559f2b6fe0fb8e64ab6667400b23

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