Malicious PDF — malware analysis report

Static analysis result for SHA-256 0271603a6e9b2cd5…

MALICIOUS

PDF

81.8 KB Created: 2021-06-14 08:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 136d2ea12c2a2d3e7504c3f99e9f8e92 SHA-1: 6c5d47ed9a4b9386e00b2c305d5b5a8134f011fc SHA-256: 0271603a6e9b2cd507ca141e03d194bb05eac7474d6d4e17f524ade4b3f8d936
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or malware distribution campaign. It contains a large number of external links, many hosted on disposable domains like Weebly, suggesting a link farm designed to redirect users to potentially malicious content or downloads. The presence of a specific URL like 'https://crewmak.ru/pbw?utm_term=sdata+tool+128gb+free+download' indicates a lure for a 'free download', a common tactic in phishing and malware distribution.

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://crewmak.ru/pbw?utm_term=sdata+tool+128gb+free+download PDF link annotation
    • https://jefibapo.weebly.com/uploads/1/3/2/7/132712451/binusa_wedufu.pdfIn PDF document text
    • https://dulumomotuvubu.weebly.com/uploads/1/3/4/7/134759228/limede_wunaf_tasis.pdfIn PDF document text
    • https://tamafivupas.weebly.com/uploads/1/3/4/6/134619560/metap_sezesenajazob_lurapugotofubuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461744/normal_60109e5933183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448347/normal_6064e50f00b72.pdfIn PDF document text
    • https://besumexuzeju.weebly.com/uploads/1/3/4/6/134646316/butuv-dojivozik-jejumux-torozazuba.pdfIn PDF document text
    • https://lepabamun.weebly.com/uploads/1/3/1/6/131636917/4bd2fa77482.pdfIn PDF document text
    • https://ferovagadimi.weebly.com/uploads/1/3/2/6/132696304/tagopefiluw.pdfIn PDF document text
    • https://danizejoj.weebly.com/uploads/1/3/5/9/135990884/limoxirukesi.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/593468.pdfIn PDF document text
    • https://zifupowipowiku.weebly.com/uploads/1/3/4/7/134722678/62243227324f05.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/da16a361ef4.pdfIn PDF document text
    • https://jeludumekidi.weebly.com/uploads/1/3/2/7/132740852/2023394.pdfIn PDF document text
    • https://nuzewotamomumaf.weebly.com/uploads/1/3/4/7/134701518/6715009.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wegisexi.pbworks.com/f/hedwigs_theme_piano_letters.pdfIn PDF document text
    • http://kedajawi.pbworks.com/w/file/fetch/144824967/48390901717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce88626c-bb8c-4e52-a2a6-f652e2d9184a/54140079774.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b316a3-c1cb-4218-ac43-70a778d3a79f/divinity_original_sin_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3c51e5-18bd-46ae-8f13-08f1869bcf0c/tolatunajajipimodumuta.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 5352 bytes
SHA-256: eed29360ea84ff341ce3859c74c5a03b10945d76a882909e786c6eff568845f9
font_01_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 12812 bytes
SHA-256: 8bb3688ea52466df59e96ff3245ae10012a74342209c16c52b432f45e6176164
font_02_sfnt_off00012b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c