Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f0a5d81b02c34d…

MALICIOUS

PDF

70.9 KB Created: 2021-03-19 10:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d8d9b8b0c9a53093a8b2ed7bc3561da8 SHA-1: 2edbef5231413fdda75b66dd9ac3eff7dd5f60d0 SHA-256: b5f0a5d81b02c34d1bd82e319e383d9d7ca6cec268a590202fb32c8d85223791
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://baarspo.ru/wix?keyword=fun+games+unblocked+77', indicates a lure to a website disguised as a search result. No scripts were extracted, but the PDF structure and numerous external links strongly suggest it's designed to redirect users to malicious or phishing content.

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://baarspo.ru/wix?keyword=fun+games+unblocked+77 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462036/normal_601a997a51905.pdfIn PDF document text
    • https://gazufapojekivu.weebly.com/uploads/1/3/4/8/134890592/840cfb25e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_6037d88183563.pdfIn PDF document text
    • https://cdn.sqhk.co/kasavakujosi/ijAhbDy/trailer_roof_snow_removal.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuronufepu/bhcTgfz/59860330055.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/VhbJhix/xmeye_login_cloud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460457/normal_5ff063869507e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498324/normal_5fcaf134026b2.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/jhaCbhe/dvd_netflix_review.pdfIn PDF document text
    • https://vipapixamez.weebly.com/uploads/1/3/0/8/130814430/2017751.pdfIn PDF document text
    • https://sefubokadizafa.weebly.com/uploads/1/3/4/8/134880044/c87bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409604/normal_602a214dbc382.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/uBjfidg/tap_inc_idle_clicker_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420245/normal_6033730457261.pdfIn PDF document text
    • https://nevozijefase.weebly.com/uploads/1/3/4/7/134748823/wujutadodixemop.pdfIn PDF document text
    • https://fezewemekerod.weebly.com/uploads/1/3/6/0/136050953/dukukefejifedag-luxarosemet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/me_abrace_mais_forte.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/vodum.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/afferent_nerves_carry_information.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/hierarchy_of_life_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/penyebab_asidosis_metabolik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 5404 bytes
SHA-256: ed8ba1af46590070dc1b91386a4341b4101ec217b792b8e03c1f397163008206
font_01_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 10532 bytes
SHA-256: fba336ba3ce21a51baecb0ecd7249138adb4ef91bfc68152b543b17375ef6491