Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34035e3a3c9c033…

MALICIOUS

PDF

140.5 KB Created: 2021-03-16 03:28:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ef0ebcb2bd75cb82987552eb93571d7b SHA-1: 6c9bba25316bd2a1d78e3ca056d30fa333d50607 SHA-256: a34035e3a3c9c0331f68df1a3484c1b8a4ed2836f589738e079367aa2ff503e8
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The embedded document body text is heavily obfuscated and unreadable, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate the primary function is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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/wb?keyword=engine%20code%20p21dd PDF link annotation
    • https://cdn.sqhk.co/salenasova/cYPaMja/60555035953.pdfIn PDF document text
    • https://cdn.sqhk.co/dusujukakal/itCVtMP/nurozefozemuju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383798/normal_600060333335e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_600b525564ad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_600d4ec23acb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376858/normal_5fe12ab1d9129.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunedevare/vzjdyiN/old_fashioned_girl_names_that_start_with_c.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/vgijeMM/saint_pepsi_private_caller_mp3_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388412/normal_603ed6212684f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5ffe66f0cd547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5fd76b05e8fb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_5ff05b7be2f35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_dafd9aa8001a40eea4bcdc1c7ff15f55.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_01b0cfec90344733b1203cd7d5481c7c.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_16b7b6153ab342cf9bac3bf31b1f6543.pdf?index=trueIn PDF document text
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_67d68a47172142d696eba6cfe0189164.pdf?index=trueIn PDF document text
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_9c0a1e0d69074158abfda0cae71542e7.pdf?index=trueIn PDF document text
    • https://1e89feb0-d301-452a-95a1-5fdc07c83edf.filesusr.com/ugd/607883_0c46fd7621444357892d1b59476f6876.pdf?index=trueIn PDF document text
    • http://meduzifovum.epizy.com/medication_dictionary_canada.pdfIn PDF document text
    • http://kedojaji.epizy.com/area_of_regular_polygons_worksheet.pdfIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_f8ef1ba1e0bc4bf69223bfa87f46159a.pdf?index=trueIn 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_off0001ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA41 4868 bytes
SHA-256: 351453a576bf78a7003024e86f9f161d27fc64c13135eb6db3f27a28281e66c0
font_01_sfnt_off0001fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FAFA 11764 bytes
SHA-256: 6b20a7fe3b3840e76536b48d3b65f16cbde1a058f173128e81d89a24e1bed6d8