Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68763beebfc2811…

MALICIOUS

PDF

65.2 KB Created: 2020-11-10 17:34:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 25e5621492a992a8ae4efa6f9e03eff3 SHA-1: b91b0f7fcf15b98c1ac785a13fb33b692c6b488a SHA-256: a68763beebfc28119b29a7d4bbe761df0b520b284ba78825288d8eb6f204b25b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The embedded URL and the document body suggest a lure related to product costs. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or 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://trafficel.ru/123?keyword=bad+compressor+on+refrigerator+cost PDF link annotation
    • https://gifedoku.weebly.com/uploads/1/3/4/2/134234788/kutodi_fenop.pdfIn PDF document text
    • https://dujenavu.weebly.com/uploads/1/3/4/3/134366251/1431067.pdfIn PDF document text
    • https://lurukise.weebly.com/uploads/1/3/4/4/134454795/fasenosumin.pdfIn PDF document text
    • https://muvitaburire.weebly.com/uploads/1/3/4/4/134441723/5953468.pdfIn PDF document text
    • https://rineragafuvotut.weebly.com/uploads/1/3/4/4/134442037/1aced.pdfIn PDF document text
    • https://bigogewoxof.weebly.com/uploads/1/3/0/7/130739615/5983176.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/zamepagamejoxer.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/wigetese.pdfIn PDF document text
    • https://visuxotilan.weebly.com/uploads/1/3/4/5/134593687/7572552.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/mikokokev_gugixefaxa.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/8f376589-8808-4cd6-ad4a-fe64986a3fad/marc_jacobs_wedding_erika_jayne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bae72c7-4f92-43a0-bc9b-cd8d184bbec9/su_color_favorito_era_amarillo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe6d09d-40be-46ba-b927-b2bc752a8982/76118052840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e76211-0c20-423c-b8dd-e5929ed1f0f0/39388757866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d75532a-39bd-4fbb-9d27-89488df3d2b7/edx_coupon_code_microsoft.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b9e154-95c7-4692-9b5e-cc33c7aa33b8/57390091493.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_off0000c1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B3 5492 bytes
SHA-256: 46b1659ce6594fd7050134b94a105be4ac0afdcc1c69ea10a15b1fa6c468bbce
font_01_sfnt_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 10464 bytes
SHA-256: e6c4197a2d35255193b30033eef88c1ebe16688e820c6ad2cf6d3e9d7145718d

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