Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b6084433251b26…

MALICIOUS

PDF

87.5 KB Created: 2021-05-13 23:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 74f319e829af33e05bf39fe032a50d76 SHA-1: 286c76b1514cb3a45968a4e73a9857aa2064bf6c SHA-256: 97b6084433251b26485725ef1e9a3b0b4f5de320eb7c294ddcd9be81e16cfd32
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious content, aligning with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 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://nipisod.ru/strik?utm_term=the+other+side+of+midnight+1977+cast
    • https://cdn-cms.f-static.net/uploads/4490746/normal_602f446727464.pdf
    • https://static.s123-cdn-static.com/uploads/4487662/normal_5ff413938edcd.pdf
    • https://static.s123-cdn-static.com/uploads/4484375/normal_5ff8446eefc47.pdf
    • https://ruvezidarumova.weebly.com/uploads/1/3/1/3/131380493/wusaxesap.pdf
    • https://cdn-cms.f-static.net/uploads/4459321/normal_6025855163f43.pdf
    • http://liko-sneakers.com/how_much_do_police_ranks_get_paidlauiz.pdf
    • https://cdn-cms.f-static.net/uploads/4421640/normal_606d8ff50173a.pdf
    • http://itclick.pro/canon_rc-6_wireless_remote_manualmcfb8.pdf
    • http://iwhite.space/health_the_basics_rebecca_donatelleo5zdl.pdf
    • http://study-english-04.space/how_to_describe_the_winds80ft.pdf
    • https://static.s123-cdn-static.com/uploads/4445324/normal_5fed1eee7ce09.pdf
    • https://cdn-cms.f-static.net/uploads/4497688/normal_602f891d71d7f.pdf
    • https://susejovidexoxi.weebly.com/uploads/1/3/0/7/130775922/tibavugamotonuvakufo.pdf
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5fe51ca8d3307.pdf
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/8857731.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_4f4a8f3c76874014b27ac3fab9b7052d.pdf?index=true
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_66e99c3da907420b88178382eb891f2c.pdf?index=true
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_29156332111943d9a99827ae7f09e959.pdf?index=true
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_6e82937f8eab47128793b33c086f3834.pdf?index=true
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_0f217d8e12d248a088d4f3c3969bb90e.pdf?index=true
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_66f27a21bd35420da57b7960b0e004b7.pdf?index=true
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_9b8cf36675e4440995a767a5b2b98b9e.pdf?index=true
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_715012670baa41bf98a8cf10883ac016.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001064a.bin
54a4d1a2ac1fbe5cfabe8d3d80d0220c63b092a0b6606b0cda178dc2b54d4d59
pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 5428 bytes
font_01_sfnt_off0001189f.bin
aa35224867ef5369512018ad9191258e11c15e15de140816dbedca3face0726d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 11784 bytes
font_02_sfnt_off00014089.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x14089 4324 bytes