Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6819a6aeb78d796…

MALICIOUS

PDF

76.7 KB Created: 2020-11-23 06:08:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c966716a7effedcbd73861b5d7c58e9a SHA-1: 3bb2c54e49dc7954dc85fd713bffde15aa61a5fa SHA-256: e6819a6aeb78d79614f08c85da20f59e57f721b33bab00e41f744150e5afbf43
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=network+speed+apk+mod PDF link annotation
    • https://warisizapot.weebly.com/uploads/1/3/4/8/134871943/gekadizinajexa.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/dolopitubolagu.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/paxaxojalimidavaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417983/normal_5fa59bc548c61.pdfIn PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/2480961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424349/normal_5fa269d993a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f9cd461cbb94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5f8d8cad89a82.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/9527818.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/0cd11858-9d44-4b78-8f79-a32d3f42c87b/alternative_minimum_tax_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea565d91-6ac1-443a-afcf-7da0f61bbf1f/bikexuwipezaxasori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1c73f0-8935-4c27-96d4-ae696fee12ba/federal_rules_of_evidence_104.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/french_pen_pal_letter_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f40efa6-5625-48af-a5fb-d7c0cb5f2eb3/pexiforepakupojab.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 5200 bytes
SHA-256: 0514b953deff9dbcab3d5dd182d21c4a184575ab558f64ab01e629466d076150
font_01_sfnt_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 2108 bytes
SHA-256: 45e5aea6c986a7fc4c29071f6eb6c7a13dac45b12fdb68fe5ab14e1e34c1c953
font_02_sfnt_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 11588 bytes
SHA-256: 80d28be38e0c6c78fdb3459effcd0321476b3433ad8909da6e815e0b7cabc401
font_03_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 16176 bytes
SHA-256: 2f22a9f04fb8f1ad5e7e1c67d3ef5331834762dd4f34dbd438692f8ae23e7869