Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f9670cc1aec083…

MALICIOUS

PDF

79.4 KB Created: 2021-05-22 14:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 91b1807a95d53b6f4c6d67837742ad9c SHA-1: e966fe66d64ce27b969b8c363e4c8a9d1933e045 SHA-256: e4f9670cc1aec083252ae94333094f7735f9da9b6554c1d6ab1a668695780d6e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+is+meant+by+assumption+in+research In PDF document text
    • https://wojadamizaxit.weebly.com/uploads/1/3/2/6/132681796/4bbdad7880a4ad.pdfIn PDF document text
    • https://xanulosuz.weebly.com/uploads/1/3/4/6/134659124/jitazotebaxigasodobo.pdfIn PDF document text
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/090d19ea3fda26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_603a434d0ca0c.pdfIn PDF document text
    • https://matopudalerem.weebly.com/uploads/1/3/5/3/135318895/lawadugedaja_zofizekusa_nurizaxejizasub_ridoped.pdfIn PDF document text
    • https://ruzizoradum.weebly.com/uploads/1/3/4/3/134317959/fogakegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368496/normal_601b8ed8dd3db.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/5943032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488101/normal_605f8d87a1841.pdfIn PDF document text
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/645ba7b297e83d2.pdfIn PDF document text
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/mopenave.pdfIn PDF document text
    • https://gunutusubev.weebly.com/uploads/1/3/1/4/131437775/solaw-veralosupoxuli-xefanejopilegag-tezupixaken.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_60505d01d2d9c.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/vudilasevizuwusiko.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/tupofelasujewas/google_pixel_android_9_root.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/luwuwonelijekezototiw.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/facebook_android_app_timeline_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24002403-5799-494c-aafd-8cbe45813fcf/uppababy_vista_2019_gregory.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/fz_200_price_in_sri_lanka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996c8628-beea-4238-bed3-0fb23ac6fe70/how_to_learn_violin_scales_fast.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/1980_john_deere_410_backhoe_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc855b41-7b86-42b4-aa36-86bcfd9b234b/toshiba_ct-90302_how_to_program_dvd_player.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/635e063b-2b4a-4225-92b4-618e1317fa2e/how_to_create_a_panel_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c92542f-b076-4e56-b720-e4462dc479b6/wretched_of_the_earth_preface_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414ad14e-c50b-483b-9a48-6df17d495209/6350654711.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_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 5396 bytes
SHA-256: 65057e017a31759ec14bc3518f3687f3499ab22dd9b1f531d61b2183ae7f64bc
font_01_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 10448 bytes
SHA-256: 6f5bed555db0fedaeedef573a3dc103dd8c1928e20b83186f9e401ad242aae69