Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd61e3626ee4aab…

MALICIOUS

PDF

76.1 KB Created: 2021-05-31 00:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1c18ee9b72bbf4ac7eb2f86a87648871 SHA-1: 89cf8f9e12db279912aca7a3170022ccb22c75a6 SHA-256: cbd61e3626ee4aabbc2964a3f9f1bfbe21939fcd5b6be5f04d22e762d3a5d3b1
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 0.9996

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://golowaki.ru/strik?utm_term=why+has+my+charger+suddenly+stopped+working PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5fc8603fce7f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_60263ebb0c894.pdfIn PDF document text
    • https://nibuxapevu.weebly.com/uploads/1/3/4/6/134601724/2603826.pdfIn PDF document text
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/1214689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_601bdd79d5b36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374009/normal_5ff3e557f2b88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_600d44f12bc8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374843/normal_602731c88cb7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445101/normal_5fdf5fbc52c1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454990/normal_60031adf5c502.pdfIn PDF document text
    • https://xitarowax.weebly.com/uploads/1/3/2/6/132681505/zaxazo_kerupidetu_kafigav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450501/normal_600b5de0b954d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385612/normal_602628b98f36e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4410952/normal_60b1312719ed9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464730/normal_60254ec464ac8.pdfIn PDF document text
    • https://zemokozovoxepuj.weebly.com/uploads/1/3/0/7/130776726/cd34d7a580856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491164/normal_5fcac97a1c728.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/e92e80de-4267-4227-b555-446c3f34abb8/lexus_es_300h_on_road_price_in_kerala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ddb80a-b3be-4d32-88f4-8d26bbe41058/halex_zeta_electronic_dartboard_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/237671fb-1333-4aa7-b7b2-3ae29ec407a3/767548059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fff78db-0d67-4b75-8696-5bcf61c1058f/6488030037.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7630b4-1e08-4410-b4f3-5f5c0596435d/wuxevunebovikovomebes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 5756 bytes
SHA-256: 6a55141f3de84d26a70d23a759eb0b2399fa722dfcdcfea8e78fafa1832f0d9d
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 10756 bytes
SHA-256: bbd2634d78f957ae45497455dc82e3313ebe550e7b0baf294191a07d0f36256d