Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5895f9c59a8f42…

MALICIOUS

PDF

89.9 KB Created: 2021-06-01 06:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4cc140515895cc518271adeaeee39c0f SHA-1: cb7e0f9debdf47dad77301cc2361a731e8eeaa9e SHA-256: 5f5895f9c59a8f422e28de43d0c41bb3ee76f790bc9cf38bb29a6821353a3551
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, one of which is associated with phishing. The document body, though heavily obfuscated, contains text related to academic topics, likely serving as a lure. No scripts were extracted from this sample, but the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/123?utm_term=aristotle+nicomachean+ethics+book+2+pdf PDF link annotation
    • https://voxonexagigiwal.weebly.com/uploads/1/3/5/3/135346225/3523770.pdfIn PDF document text
    • https://pabeliribid.weebly.com/uploads/1/3/4/3/134384766/bajipu.pdfIn PDF document text
    • https://fewupebotugap.weebly.com/uploads/1/3/0/7/130739906/5d7e94219f115f.pdfIn PDF document text
    • https://sejiganabukuja.weebly.com/uploads/1/3/4/5/134585043/a638554515ac2d9.pdfIn PDF document text
    • https://jubabanijawema.weebly.com/uploads/1/3/1/0/131070146/3185498.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488100/normal_5fd086c166e43.pdfIn PDF document text
    • https://vetovevigu.weebly.com/uploads/1/3/4/4/134486276/8739995.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417818/normal_60b0bba10a493.pdfIn PDF document text
    • https://logavamu.weebly.com/uploads/1/3/4/7/134746434/8758708.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_6005f499e22c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496812/normal_5fce813d9a06d.pdfIn PDF document text
    • https://fogoranamixite.weebly.com/uploads/1/3/5/3/135390362/bevozatep-litirakimiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5fd673d95d126.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/3638863.pdfIn PDF document text
    • https://rapekazojeroxe.weebly.com/uploads/1/3/4/6/134697974/4545532.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4424935/normal_60b3591860d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470962/normal_601f2bb8f0df0.pdfIn PDF document text
    • https://bofazoxoniwepiv.weebly.com/uploads/1/3/4/4/134454835/kodagamot_mebevujudopova_lijuvulub_vorozog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1dd4ba2-740f-4292-b340-231391465516/what_is_finite_element_method_in_matlab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fb161b6-7efb-4df0-839c-18b5c5dca1d7/how_to_determine_leverage_ratio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a90f8ca-e418-4467-a5a6-1ca8759f247f/75418391755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57e064fe-8e80-438b-854b-7a52dbc49896/how_do_you_know_if_a_person_is_filled_with_the_holy_spirit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc893797-1538-4b6e-86c7-b7c479b7a0e0/75267470146.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_off000122b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B6 5720 bytes
SHA-256: 99f61a7f7b983ff088e03f682ad341f3ae9d196465cdd5f4ca2d1317bb6e79bb
font_01_sfnt_off000135fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FD 10596 bytes
SHA-256: a3f77c5823a5417b6476f84862da8bf6980d73f3c1564adf108f03b6bb7339c9

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