Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b648bdadf91849…

MALICIOUS

PDF

77.0 KB Created: 2021-04-23 12:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8e2c28a6950c3a60f9e394a4a2d176a3 SHA-1: 5a38482b34634df4191cf5eb3b746b5ec8330855 SHA-256: 16b648bdadf91849cec79ad16622c4a7ee74e6f61c7c1426e985eb303ad28999
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://ponafet.ru/strik?utm_term=architecture+form+space+and+order+pdf PDF link annotation
    • https://fewidatemuvej.weebly.com/uploads/1/3/4/2/134266352/fuvewi_dedikon_wuwafinerenumam.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/davome-vexuxux.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/wifuruguvekufomogef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371786/normal_5ffd57ce548b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420248/normal_5ff407896f16e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_611c2cd6a9d64a44b847a3b553bf01fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c38bc7-e6ea-4866-a39b-df86ca408c18/our_global_environment_a_health_perspective_study_guide_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/wedewamigupomipuwiweban.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/vosagitax.pdfIn PDF document text
    • http://durakukulutozar.epizy.com/87102355590.pdfIn PDF document text
    • http://vuwadiwotaja.rf.gd/rafetubebifepikiverilofor.pdfIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_370cd992ed454aa286fabc191f7d4e9d.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_a7a229d663504701813b01a99f585dd5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/09dbc84c-3c5d-4208-b134-4dc84584eccc/7573521553.pdfIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_ed8ec26cb9cb4ef89c7e81817cb635d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a314ce43-ad50-4579-8f37-68117a233d50/turnigy_9x_9ch_transmitter_w_module__8ch_receiver.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/asccp_guidelines_for_abnormal_pap_smear.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 5352 bytes
SHA-256: 203b7ed7730d0dfebfd05080d8cff653abe488b662e7900187a4a413338ddfe4
font_01_sfnt_off0000fa6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6D 15968 bytes
SHA-256: c18ec540b8dd156e36f50015b28b1100fcc37bc641781acffcc75425ddfad289

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