Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcb9f4835342b48…

MALICIOUS

PDF

87.1 KB Created: 2021-04-05 06:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 029b33cca17f8415853d16470918ddd3 SHA-1: 6abb3e500fe3a4d5f45c5d4264d615784875c438 SHA-256: 3bcb9f4835342b48a465e51e8a4c9b2eb788e53136c304c797373e10562bce53
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to 'the hardest thing about hard things pdf', directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=the+hardest+thing+about+hard+things+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fd1e0930e011.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/vilinanivutulat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374976/normal_6013785a3501f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495838/normal_602d7b806dac1.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/54791764965.pdfIn PDF document text
    • http://majusenise.sportsontheweb.net/popafudezabapelebovuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_606a747eab155.pdfIn PDF document text
    • http://jujovobima.getenjoyment.net/pm_awas_yojana_form_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468823/normal_600143c123a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_6066a7cd038c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471474/normal_5fc5703675d0b.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_e67411078b5d44e1aa07af6ece16a3b7.pdf?index=trueIn PDF document text
    • http://patudesaruvob.atwebpages.com/33540798969.pdfIn PDF document text
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_02636165ff934a649fefcfe88972e62c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c99e8d-4dfd-4589-8c33-93c206cffae0/40178168725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac8fe648-1ecc-47b0-a398-701466953847/zokis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1af522-4788-47d1-8091-9dacf6b4b405/19127769694.pdfIn PDF document text
    • http://noxukimu.myartsonline.com/bsa_baloo_training_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a53462-8630-482a-ba93-13d546680ff8/90309183138.pdfIn PDF document text
    • http://jugomirusulove.atwebpages.com/raxopitoloneja.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
stream_003_off00010308.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10308 13180 bytes
SHA-256: e62feb739ddaf926c0e51defc037175db72446459bb429060a707e0da70d63fa
font_00_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 5360 bytes
SHA-256: cdf0421ed806cab040c9e748fd94bec7e969e3ade7396b4f6506e35475d0c8a2
font_02_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 12568 bytes
SHA-256: 9a71554a7c5961ca107b77900c07fbe270628554084e0f38fc04d805021ac50b