Malicious PDF — malware analysis report

Static analysis result for SHA-256 1feab8707be4b1d8…

MALICIOUS

PDF

100.6 KB Created: 2021-05-20 06:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 25be1a5b2af994e4d3ae2ee01d946d47 SHA-1: ec7529e151531c1d48ce815b2b500e00bc3e5abb SHA-256: 1feab8707be4b1d808a12e92c9647e0bba4381ff27284b4e42358bfd5801ba10
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, a common tactic for SEO manipulation or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary technique being the distribution of malicious content via embedded links. No scripts were extracted, but the structure itself is the attack vector.

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://xezojetit.ru/strik?utm_term=literary+devices+meaning+and+examples+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417049/normal_601a37b074597.pdfIn PDF document text
    • https://miwolugakibu.weebly.com/uploads/1/3/1/3/131383652/81703c541b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480174/normal_5fd1cd40917f9.pdfIn PDF document text
    • https://luvepuxoworusoj.weebly.com/uploads/1/3/4/6/134660421/rozedenasija-vuligepalubupex-wulukuributiko.pdfIn PDF document text
    • https://samojosaletope.weebly.com/uploads/1/3/4/0/134017273/pizewojugerusabeg.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/nigabevepeve-fagevi-kofometetovuxef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488855/normal_6056c92cc92ca.pdfIn PDF document text
    • https://fegopamaxu.weebly.com/uploads/1/3/4/8/134896151/gulasimimagekekika.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_6034e4ba39ea0.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/tewesideduj.pdfIn PDF document text
    • https://loxujonukirurob.weebly.com/uploads/1/3/0/7/130776454/resesutukukaka-kalasipanoz-boluxizekima-lamun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_6038116b831cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_605f81571f618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450251/normal_600502e6df8d8.pdfIn PDF document text
    • https://dawosovakix.weebly.com/uploads/1/3/6/0/136097295/fovojit_xetokasa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404310/normal_5ffac7d6c705c.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/32cf4d4a-43d7-4fab-971c-e3ae2262a88f/pazomuwep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4673063-245d-4f71-8980-6404ea5ea3a6/sentinel_deluxe_22_revolver_r-107_ammo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61cc707-a6bf-4ffd-851d-c80f6953a24a/dirty_little_things_michael_faudet.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_off00013764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13764 5324 bytes
SHA-256: 289491c8392fc1878af5d6aa28bc2b03d23379352d91f4664c75f7bbc7f30436
font_01_sfnt_off00014977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14977 13256 bytes
SHA-256: 12d7e9563f635acb21d1336a6c3dddcab1021fee0dada2c526a51de75f315631
font_02_sfnt_off00017510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17510 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2