Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fdc27906ff7bee…

MALICIOUS

PDF

83.5 KB Created: 2021-01-03 05:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 90bcaa6b9d6d81f744bf3c35db689911 SHA-1: e4ef7d602784aac6de64717bb47897fbde5bb5d0 SHA-256: 33fdc27906ff7beef28fee7bd90b16514d73bf5d30938a2fd12e490846509fbe
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which are disposable. The heuristic firings indicate this is a link farm, likely for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=molar+extinction+coefficient+units In PDF document text
    • https://togurekeve.weebly.com/uploads/1/3/4/0/134040335/sonarosipefowu-linajobolupixog-gamedawegak-roturavake.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/ihcihEf/sijunilanogavezumawagat.pdfIn PDF document text
    • https://zediruli.weebly.com/uploads/1/3/4/7/134725524/375ba231f153.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/jevaxuzo.pdfIn PDF document text
    • https://wusinetowaje.weebly.com/uploads/1/3/4/4/134471696/7624377.pdfIn PDF document text
    • https://susesape.weebly.com/uploads/1/3/4/7/134734791/boboruremi-bezadokej-zululuputeg.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/a74a8160f26.pdfIn PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/5612351.pdfIn PDF document text
    • https://cdn.sqhk.co/kevejonob/gihcttg/10008887152.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/dmhggjD/tolawexideruwixunur.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/02126702-764a-4483-abce-f10bc3efa996/67161359840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71994ccf-fc87-44ae-899e-a63149201181/tizigexiripotoxujosuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c75fbfe-7d4b-48b6-9c10-b1e37857ce18/texuboseverasomilafuxi.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
    • 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_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 4948 bytes
SHA-256: f0d5960e3786af2751b9a734f3b8d448e676187b3d0468eba24badf39ea4aa31
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 11892 bytes
SHA-256: ee1a3dbda6ad165eef51260e73cae3249c7d45ef77f1119cf2b8c0a33fd80dae
font_02_sfnt_off00012be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE5 16064 bytes
SHA-256: 5355995778af6fea050508ce4debc46bc2ba7deab687ac039556469e1bec84fc

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