Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2676ed3d564c9f0…

MALICIOUS

PDF

82.1 KB Created: 2021-04-17 14:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 62dfca917c5af855f6ae292cc9aaac2f SHA-1: 57701f734192dbb304aa45709b6f5ffca5641bc8 SHA-256: b2676ed3d564c9f083e9c3a97741fd1651f75a304cb01c1ba2abbee2e4a85569
186 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. 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 0.9997

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://mezovuduw.ru/strik?utm_term=dodge+ram+repair+shops+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414339/normal_60325a4dba683.pdfIn PDF document text
    • https://nuribivavis.weebly.com/uploads/1/3/4/6/134625990/1363669.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475375/normal_5fefafd98a5ea.pdfIn PDF document text
    • https://pawupakupofodav.weebly.com/uploads/1/3/5/3/135388754/lugatelekus_xamidobavuwez_samefatenobow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_600d0499a845b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_5fd8287ec2b8e.pdfIn PDF document text
    • https://fowazepare.weebly.com/uploads/1/3/1/4/131406063/mudivezebe-vowubirofub.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/b4dab4ceb4fcda.pdfIn PDF document text
    • https://wibizoginoj.weebly.com/uploads/1/3/2/6/132681485/duruzaxexuwobo.pdfIn PDF document text
    • https://tijanowu.weebly.com/uploads/1/3/0/7/130739502/mapegasedif_bogazeleka_demenipul.pdfIn PDF document text
    • https://binikefesomeb.weebly.com/uploads/1/3/5/3/135386190/820550.pdfIn PDF document text
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/fexopezo_puzamanifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_605d871f2b3e9.pdfIn PDF document text
    • https://dexulivixuwe.weebly.com/uploads/1/3/0/7/130739852/tezawupedaxuxumejon.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/99247c16-0d1c-4460-a9b6-15a0da7d7345/how_to_unjam_swingline_heavy_duty_stapler.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_b841c06cb0b64b24a1101f9e943e952f.pdf?index=trueIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_b08dccffef2f4c9ba484bc587b0751f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c13814-5730-41d6-808b-1192e128ad8e/gokavefodalowiwaroponu.pdfIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_7af9db5106284476ac01707e725cbeec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd64fae9-fbc2-459f-ae2f-5082a78b5708/viwagovukufudujodi.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_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 5048 bytes
SHA-256: a806b0b1159566e5390019b73afbad6ae7a5f4d9ffc29e5adbb8d067204d4979
font_01_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 10480 bytes
SHA-256: 691bc5c2ef466320194f9eb51e7de1eb9fedd0b18cd10762c75758ebc244f9f5
font_02_sfnt_off00012c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176