Malicious PDF — malware analysis report

Static analysis result for SHA-256 db87de075c14da30…

MALICIOUS

PDF

81.7 KB Created: 2021-03-02 02:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4e8d1c5658c158cfe758347417825027 SHA-1: 07a460cb303f90fc7bf65804f392885715e781b9 SHA-256: db87de075c14da3053938491a0269d456e4bc8ca834b5f73a194fbc53cea1a17
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous external URLs pointing to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple disposable hosting links and UTM parameters suggests an attempt to obscure the final destination and track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=la+amortajada+personajes+yahoo PDF link annotation
    • https://cdn.sqhk.co/fevivesuxofo/ggjeijB/cookie_maker_iphone_app.pdfIn PDF document text
    • http://mavpa.fun/heroes_of_olympus_son_of_neptune_summaryiwqmt.pdfIn PDF document text
    • https://cdn.sqhk.co/susorajin/vghheib/nasacort_spray_generic.pdfIn PDF document text
    • https://cdn.sqhk.co/kufejagefep/ii2ijgg/heroes_of_camelot_card_shards.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/recon_flag_warzonep00sb.pdfIn PDF document text
    • https://gidipefodato.weebly.com/uploads/1/3/5/3/135348522/xagitelatererasepogi.pdfIn PDF document text
    • https://lebivituwaw.weebly.com/uploads/1/3/1/8/131856954/1434819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483608/normal_5ffb8d467758b.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/gKugIXh/29944547686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_5fd6142c058c4.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/rozezevijotono.pdfIn PDF document text
    • https://namosupegu.weebly.com/uploads/1/3/4/3/134313644/3614622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463807/normal_5fecb4f85e3ce.pdfIn PDF document text
    • http://nesobaka3.xyz/southwest_gate_information_denverdu32c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_60256eec94bd4.pdfIn PDF document text
    • http://organicnu.info/indoor_water_parks_in_ohio_with_hotelhwovv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393637/normal_5ffac39bd09e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423696/normal_602bac5fe1620.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limazajot.rf.gd/arabic_letter_tracing_worksheets.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_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 5284 bytes
SHA-256: 6c297fa7532605579d1ad37159e7e0f78824b15bbb18f7de9b7d068e28f585ee
font_01_sfnt_off0001138e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 11240 bytes
SHA-256: 9543defebc43ea8b058eba715d1319246d545713bf827a75ee7056639f2e9f89

Open this report in the interactive analyzer, or submit your own file for analysis.