Malicious PDF — malware analysis report

Static analysis result for SHA-256 4926037e387637b1…

MALICIOUS

PDF

77.2 KB Created: 2021-03-20 10:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c8305945a9258a8d6791fba5cddac42e SHA-1: 94354c7e152b1ae81cf38de554c09903659b7db4 SHA-256: 4926037e387637b194f256a4fc2c05a957056e87f0bc64916c3d1184fffc0bf9
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://fokemale.ru/123?utm_term=about+us+clothing+template PDF link annotation
    • http://olipaka.xyz/marvelous_meaning_in_kannada95rze.pdfIn PDF document text
    • https://sodapovi.weebly.com/uploads/1/3/4/4/134494820/kujulewo_nafudawogawat_pamujetepubofu.pdfIn PDF document text
    • http://italdom.fun/55085206506fpt9j.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/jZibSgh/66881278741.pdfIn PDF document text
    • https://cdn.sqhk.co/fukaxaxod/qhdAjjj/try_not_to_laugh_challenge_super_hard_clean.pdfIn PDF document text
    • https://kegozorud.weebly.com/uploads/1/3/0/7/130740561/zaradejete-vatefajaf-zuwivopu.pdfIn PDF document text
    • http://confirmyourverifiedbadge.com/hoe_scannen_met_hp_deskjet_2547u3k7o.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/B3gghdV/basic_english_app.pdfIn PDF document text
    • https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/9d9e15df016.pdfIn PDF document text
    • http://construt.site/50859490421ru3da.pdfIn PDF document text
    • https://tatosexu.weebly.com/uploads/1/3/0/9/130969313/4974967.pdfIn PDF document text
    • http://getegenufiduso.66ghz.com/how_to_adjust_the_pressure_on_my_pressure_washer.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/fokaba-zolakedewimejap-ligopabazozatu-muberiwidimug.pdfIn PDF document text
    • http://vertitribe.store/1199710232479fho.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_96885e1327dd4c9797bcbb049beb6399.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e2aff1a-7772-4af5-9820-44b1988ede14/99360694634.pdfIn PDF document text
    • http://dutagewenurodub.epizy.com/kennel_club_judges_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b1100c-d371-4075-bfa1-12584d9e0ff4/28119417831.pdfIn PDF document text
    • http://figaniver.epizy.com/inter-_agency_standing_committee_iasc_gbv_guidelines.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_48ea442fd1b440ed8ea50cdeaa3415f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a868a373-dfb9-4dcb-a13a-96005586d47c/99346429930.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_d4f8bb61c4204b6799d85d728cf7701f.pdf?index=trueIn PDF document text
    • https://a22cca75-cc8f-459c-9eea-628147015b55.filesusr.com/ugd/2f8a36_a0b760afb49649fa8fc32fc821afd3f5.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_bf60bb8683f748d088036b5c3b6d4cca.pdf?index=trueIn PDF document text
    • http://misujeguseb.epizy.com/oxford_english_for_cambridge_primary_6_answers.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_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 5380 bytes
SHA-256: b90d6f8f805b1315d6bfa6c7f05587468d18511c8fd568943357726c5be180f4
font_01_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 10752 bytes
SHA-256: d40857f605974d5dc4e5663b5dca9951ac97836490a6454b0325602d724b176f

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