Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b2118987775a05…

MALICIOUS

PDF

83.9 KB Created: 2021-06-11 15:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bf0da7f440b15faf5ce2c936cfcc92a2 SHA-1: 9054fbc7238d88b68c35fb2db242baff9b3f1a10 SHA-256: a3b2118987775a0561a513505c9b7203d77aa13b9dd94aedee37c1b2d40ba0eb
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with multiple URLs pointing to disposable hosting. This behavior is characteristic of SEO manipulation or phishing campaigns designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://archism.ru/pbw?utm_term=fire+fire+advanced+server+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418368/normal_5fda91c071129.pdfIn PDF document text
    • https://rokotejipap.weebly.com/uploads/1/3/0/8/130814190/ruvamil-zogasamerusar-komogige-sowazatan.pdfIn PDF document text
    • https://ranogokosupevi.weebly.com/uploads/1/3/1/4/131454436/xizegojikiter-tetosovilogopu-wozedobotefakep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426942/normal_5fe5c60e5878f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4446496/normal_60b3399baad86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_6036050c462b7.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4447906/normal_60b2ffd88672b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371004/normal_603f414fe99d9.pdfIn PDF document text
    • https://gataforebulor.weebly.com/uploads/1/3/4/3/134337884/1711466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488133/normal_5ff9d37e9481e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527108/normal_5fe0ae155d2b8.pdfIn PDF document text
    • https://pusexijubod.weebly.com/uploads/1/3/5/2/135296384/d73ab2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_604f54c813848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_6048c4082dfee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_603a68fd496fe.pdfIn PDF document text
    • https://kasuvimifimo.weebly.com/uploads/1/3/1/6/131637099/kipudebunejokugo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479226/normal_5ff1ed55f0a9c.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/894cd545-93d8-4004-9a4c-3417ea27534f/hp_officejet_pro_8600_paper_jam_wont_clear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618d5d5b-d03e-4c4f-9c74-4964a08a1b0a/modezironuluxovopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1979b18d-6bea-4d96-b059-a30a2d2580ef/who_is_the_girl_in_the_new_doritos_commercial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12964b3-2fec-4796-bbfb-1af65dc2b268/dejaferiwutisawukepefig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81eb592a-abe4-4a7f-ad1a-bc04d59b7cae/printable_map_of_europe_with_country_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464d79eb-ee0a-47bc-b0f7-65cdd0284fbe/2008_jeep_wrangler_x_2_door_for_sale.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_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 4792 bytes
SHA-256: 901c555f76fec652f30e684ee62551933ae1b199af67d2534e068c9cfcc28774
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 10256 bytes
SHA-256: 8e27e81ef435941b0ff3f7049809136a9c531393dcfe24cbbc3cb4dec4bdd2b7
font_02_sfnt_off000133ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133ED 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e