Malicious PDF — malware analysis report

Static analysis result for SHA-256 7953572704886f2e…

MALICIOUS

PDF

83.5 KB Created: 2021-04-01 11:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 037b49be05d6072c30e71a76fda20c4a SHA-1: 0e8e9b51f84278520470040b9641952de11b660d SHA-256: 7953572704886f2e097933103be9b4849bc73cb5c51e05777a8dcdabbcdbf1d2
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or SEO spamming operation. The primary external URI points to a URL with a 'craftsman air compressor pressure switch repair' term, indicating a lure to attract users searching for specific terms. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of malicious intent, likely to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://baarspo.ru/strik?utm_term=craftsman+air+compressor+pressure+switch+repair PDF link annotation
    • https://cdn.sqhk.co/rapawaferew/kgtggr6/fury_watch_face_premium_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_602faeb97e996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_603048fd1c6b4.pdfIn PDF document text
    • http://about-central.com/73554831120hccc6.pdfIn PDF document text
    • http://amandeepsadyora.com/cours_anglais_debutantqufuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_5fdc2eb20d30c.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/cMjihjF/zojopalati.pdfIn PDF document text
    • https://cdn.sqhk.co/bularalunop/hAwsid4/sidekodawevagizumenika.pdfIn PDF document text
    • http://elerctum.org/crayfish_dissection_pre_lab_answer_keymru3m.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/YxTxUge/vasozugapejigexagilire.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/KIgdVgd/bijawufafomijijudireti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481069/normal_5ffb4a3383569.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/hj3ic4l/off_road_motorcycle_riding_in_colorado.pdfIn PDF document text
    • http://speak4pro.com/33284634704qoqxp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_66dfa99558174776a445e207ad5388a1.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_0a3a4e0773eb4de0aa47ff6a736287d3.pdf?index=trueIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_53d906854b12443395bc18c279b53c50.pdf?index=trueIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_57a4562791484f72bb17162b91edbc2a.pdf?index=trueIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_ce1019e3aaac42d4a2b8f0d62180cb56.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_9c59dd1f5cb543cd89d6dfdac5c66566.pdf?index=trueIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_fd211b8fb53b4399a7c09c4e8d2a8979.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_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 5220 bytes
SHA-256: b794569ce670ec8dc8822382b02934a304394feda0b5a1b36912a290aad9c4c6
font_01_sfnt_off00011a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 11112 bytes
SHA-256: 60755e306d5082d780a2ad00580ef21f0aba106daa4bb69bf7c94c292e2efa61