Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51ecb3e5687d37a…

MALICIOUS

PDF

70.1 KB Created: 2021-03-19 22:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e0c92ab81daa7964fb72aae1f5bf737c SHA-1: b1713455c5dc484c77155b163bf124755620e7e0 SHA-256: d51ecb3e5687d37a8074f557e0413e0ab2e2d34161b17f360d596051d8d73d25
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

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://midufefew.ru/123?utm_term=lyreco+label+template+word PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458428/normal_6034236c02905.pdfIn PDF document text
    • https://rigafimer.weebly.com/uploads/1/3/4/9/134901715/058b42ac.pdfIn PDF document text
    • https://radixukawatezod.weebly.com/uploads/1/3/4/6/134645496/c0612c2e.pdfIn PDF document text
    • https://livaganomin.weebly.com/uploads/1/3/4/3/134399079/lovatimerege.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388040/normal_60076b7946ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_604f56f16bac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_6018a4392f251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369311/normal_5fe5629abd91d.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/wakuzidi/blended_full_movie_free_480p.pdfIn PDF document text
    • https://f22a9904-e884-4e4b-b219-c70c7d184214.filesusr.com/ugd/a298ce_bcd7073ee56e436f9d91c5e55da92668.pdf?index=trueIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_da82b1147a544c5782790b90bf14b037.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/girl_with_the_dragon_tattoo_sequel_imdb.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/equivalencia_de_5_gramos_a_mililitros.pdfIn PDF document text
    • http://wuzukakixete.rf.gd/gosirivulik.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_ec3347585d1f4083a48f65bd97abf273.pdf?index=trueIn PDF document text
    • http://mejizemobimoli.epizy.com/literatura_e_resistncia_alfredo_bosi.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_57072c8501ac45a8a34b8422b3cd2852.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/53031544507.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_92d6a1e33540408fb00f2bb63da88ede.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 5316 bytes
SHA-256: 69a49464c4a67741d2df60e1856b5e858a96ec767abb5981f7812d214bd4fe4b
font_01_sfnt_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 10852 bytes
SHA-256: 6effbdd47e62f4d5efc2128bbb46220f2882101406727975f8ee915ad90312b7

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