Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf7c4f64f038b1a…

MALICIOUS

PDF

84.2 KB Created: 2021-03-23 21:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 244df4a017f4ef7729d2007fa4ea99ee SHA-1: ee1c1df01c73ccc92c2866aa9d690af6369ffc1c SHA-256: fbf7c4f64f038b1ab07601b486a32e64f07cc5304cc3a41b1a03fe1452ad57ce
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. It impersonates Microsoft, suggesting a credential phishing attempt or a lure to download further malware. The presence of embedded URLs and the link farm heuristic indicate a strong intent to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/6923597.pdf.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=buoyant+force+problems+with+answers PDF link annotation
    • http://uspex22.online/31554009303o496f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_600e83e37f20b.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/yiehhii/home_assistant_nest_doorbell.pdfIn PDF document text
    • http://devgm.design/brahma_murari_surarchita_lingam_mp3_song_free_download_tamilydp87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470040/normal_5fd3bcb3d53f9.pdfIn PDF document text
    • https://cdn.sqhk.co/rotelizedo/6a8ngAM/spellstone_kongregate_wiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426545/normal_6019d600a1777.pdfIn PDF document text
    • https://cdn.sqhk.co/ropobemuma/dkIziih/strategic_planning_for_nonprofit_organizations_template.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/6923597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_6012ce788e9a7.pdfIn PDF document text
    • https://cdn.sqhk.co/davunosedepa/fhfhphc/pass_a_test_with_flying_colors_crossword_clue.pdfIn PDF document text
    • http://shop-profildoors.ru/tom_clancys_jack_ryan_moviecvhba.pdfIn PDF document text
    • http://taptopbot.com/download_microsoft_office_professionn1d1l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_601b8d9d99d72.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/bsQgfXf/motifupemexofu.pdfIn PDF document text
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/8909680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_6038fcfe83b68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391649/normal_5fe2621ebdb4e.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/hHjcCX3/knife_sharpener_in_spanish_translation.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/dhbSfQm/champaign_social_work_jobs_toronto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 5640 bytes
SHA-256: bba88458b1f836e8bb27a842b7f8fa7a7bf03453c131fc9cb505651c85253518
font_01_sfnt_off0001089f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089F 11068 bytes
SHA-256: 3734f92d27f8f26de0ad9b08b8ec23bdb856b9426910e1495998f7f51aaa8446
font_02_sfnt_off00012e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7C 16096 bytes
SHA-256: 3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841