Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bfeae8bac68a5b…

MALICIOUS

PDF

80.4 KB Created: 2021-03-25 03:10:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 128268ddbf23ba291de1c2c07e39244e SHA-1: fc2262859bf5b4c5f39ae10fcb081f49186a3b00 SHA-256: 27bfeae8bac68a5bd8971b26afc542780d8c4584ac002b29a826792c3ae48b59
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for further actions.

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://resalured.ru/wix?keyword=a+book+is+a+loaded+gun+quote+page+number PDF link annotation
    • http://golomashvanna.xyz/newborn_pictures_near_mepvqrg.pdfIn PDF document text
    • http://housefashion.ru/marc_jacobs_shoes_size_guide974ty.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/4612383.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/hdtjagi/2833198742.pdfIn PDF document text
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/d81e7038.pdfIn PDF document text
    • http://getbuiss.online/rovefakelapapozatp97e.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/b8vVUhh/oscar_the_grouch_costume_for_dog.pdfIn PDF document text
    • https://pixizibonemitu.weebly.com/uploads/1/3/1/3/131382366/datejobiniw.pdfIn PDF document text
    • http://abanca-electronica.com/red_star_over_china_amazonfl0bn.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/1670732.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d7b8932c-0ff7-4212-a939-e1d0095db566/how_to_reset_your_thermostat_honeywell.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f100080-d967-4938-ac25-6b54d1d9aec0/87239365206.pdfIn PDF document text
    • http://kipijitifexus.epizy.com/2978387479.pdfIn PDF document text
    • http://dajomezivurisal.epizy.com/cabrestante_manual_4x4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba915b04-dfb2-4d14-9c0c-7f1a5e258e66/75296649766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac95525-40a5-45dd-baed-4e73ee3e2612/nivirojojovitetujiwaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceefad45-a371-407a-b629-dc567e1dad50/hoover_windtunnel_max_capacity_pet_upright_vacuum_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88f7a78-bf4b-4807-b981-ba25e1e0e3e3/97084860693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1545684d-3806-4126-a2c3-e0de9a464951/python_data_types_and_data_structures_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b31290f-9666-4b0f-ab79-e6293fd91683/when_to_use_binomial_poisson_and_hypergeometric.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_off0000ede4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 5480 bytes
SHA-256: bf5a4416f52837073fdbe3669eb7dc95990f101e063ff758d78a32c74736f70e
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 11140 bytes
SHA-256: 9c327ce784e5cd9b1ba633f063eab79f29705a5ba8a13f2c757aef15193c018a
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3