Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa3fa8cdb9e52a6…

MALICIOUS

PDF

85.6 KB Created: 2021-04-02 20:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5abe3518479d7e09ee94d78c5c3e916b SHA-1: 22a1ae3479c79d79df7689a7cac20617e39a7e66 SHA-256: baa3fa8cdb9e52a6e20fcd4ecd709de29b25d2d02b233ff807ec122685a89d78
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many of which are algorithmically generated and hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though partially corrupted, contains text related to 'Affinity photo pdf manual' and 'wkhtmltopdf', likely intended to deceive users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://zajinet.ru/award?keyword=affinity+photo+pdf+manual+for+your+enjoyment PDF link annotation
    • https://nifubadipapa.weebly.com/uploads/1/3/4/3/134388301/temofegolopurufiwi.pdfIn PDF document text
    • http://razvivatel.blog/nipuvowobizpok2.pdfIn PDF document text
    • http://nubatevujonuw.mygamesonline.org/dolavonidinixuze.pdfIn PDF document text
    • https://buvelixajotoneb.weebly.com/uploads/1/3/5/9/135982000/d86d5d46551fd.pdfIn PDF document text
    • http://torchland.xyz/85647434194sajre.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_60426dbf1bcd3.pdfIn PDF document text
    • http://salufogi.iblogger.org/71547200186.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/1822286416kbe4t.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/30e269122a7d1.pdfIn PDF document text
    • https://namodezax.weebly.com/uploads/1/3/6/0/136055978/janulowe-tikuzijiga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403283/normal_5fcf28e860cc3.pdfIn PDF document text
    • http://mnclassis.org/how_to_connect_bluetooth_mouse_to_apple_computerz4x4h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_60110ec0a4112.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/business_loan_agreement_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fc7facb160d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_602099ea71684.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_cd0e71af916243f1b204921e1b28d270.pdf?index=trueIn PDF document text
    • http://rotikozezusigis.rf.gd/company_profile_presentation.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_a4f6591cc8a049d6b9d01c0291419b43.pdf?index=trueIn PDF document text
    • http://lelirovosas.epizy.com/applied_physics_mcq.pdfIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_3ff8251cf2154f459d5b1caee5d4c03e.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_fe0ce504d82d4a04a2a41e3af06d6604.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_07e342da11884461984026b0f56d68c8.pdf?index=trueIn 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_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 5272 bytes
SHA-256: 242dbadbecd6051bf2c763920e6a62c7d17324690fda751b17074c1026daf3ca
font_01_sfnt_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 11780 bytes
SHA-256: 88d9bb1e4678d91bd25e8b8d65e0b6cea0adb5313b13ad8a55a93f7879de7b49
font_02_sfnt_off0001331e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331E 16204 bytes
SHA-256: 0318b400cbd4eb80818b7eb131bcca2e18f343f850c5eb1573e525fea31f4d56

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