Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b2b898746e2ea7…

MALICIOUS

PDF

79.2 KB Created: 2021-06-09 12:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6cabe1abfb04ea6e94e4debb43783c5b SHA-1: 8cd912d429ae982db24ec95d8fe6f44b40078036 SHA-256: 76b2b898746e2ea7efdfed6aefa81f7613a3ac255c54a73a1c97012b51b85088
206 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. It uses an "enable content/editing" lure. 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 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://queure.ru/pbw?utm_term=advanced+economic+theory+by+hl+ahuja+pdf PDF link annotation
    • https://pigodebi.weebly.com/uploads/1/3/4/8/134864190/gabimuwobirizi.pdfIn PDF document text
    • https://votebefi.weebly.com/uploads/1/3/4/7/134715150/dbc1bc86.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/7086944.pdfIn PDF document text
    • https://jomupalekiloja.weebly.com/uploads/1/3/4/3/134310494/giwedevepibemexegidi.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/a023441f27.pdfIn PDF document text
    • https://lodovape.weebly.com/uploads/1/3/5/3/135350971/6553246.pdfIn PDF document text
    • https://rafoduju.weebly.com/uploads/1/3/4/6/134680113/mowikopepegu.pdfIn PDF document text
    • https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/matiwufe.pdfIn PDF document text
    • https://rojogibolodo.weebly.com/uploads/1/3/0/7/130775817/6e8ef2368e2.pdfIn PDF document text
    • https://rewizefugubopu.weebly.com/uploads/1/3/4/2/134266162/jurivefunagaxumaj.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/ac147c2a-6e5c-4603-97b2-6c0e518888a5/bileduxutupineso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b255ca-b030-444b-acd6-3bb0f836d257/sobopaxaxik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb85595-ff5f-4667-ae7d-8b2550be0736/sistema_endocrino_funcionamento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9d697d-585f-42ee-b221-4df1972a728e/interior_design_profession_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d87d23-7425-44c4-9232-f4ce799aa14c/feroj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c8707d-011e-4bed-84e7-902c798be93a/47400419541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06ef15d-ea5d-47e2-af7d-266e1149990f/54639584352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b52771e-9dc3-4960-ac4e-d4f050bae350/miwugisidatepedovak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6af8fd8d-7ce7-47e9-8ff5-c993d9b357d1/what_is_the_story_behind_cain_and_abel.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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 5584 bytes
SHA-256: cecbd306194c918f99cbf96651f4194aaac41f5f3261781366b2acbb969ec5bd
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 10648 bytes
SHA-256: d6e0ce84a297c84823217e2cbbae83850e4ad82eeca593d08d84176b8e1c8508
font_02_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6