Malicious PDF — malware analysis report

Static analysis result for SHA-256 b032dcfa8cab9482…

MALICIOUS

PDF

79.3 KB Created: 2021-01-06 05:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 62e22c38a09817cc04c1761838ee7121 SHA-1: e3b78059f24adb2a24743440018f04692842c1dc SHA-256: b032dcfa8cab9482962a0e2df3ffa421ed461699f38331e651cec34b785b61ae
214 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 embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or phishing. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'traffmen.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/aws?utm_term=german+passport+application+form+nz In PDF document text
    • https://cdn.sqhk.co/satofapo/ahj1e2c/32917557485.pdfIn PDF document text
    • https://nonegisetuku.weebly.com/uploads/1/3/4/8/134877303/dagejuvofo.pdfIn PDF document text
    • https://cdn.sqhk.co/jalafimimodo/hfwhhjd/snake_colors_poisonous.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491153/normal_5fc3ecc0768fe.pdfIn PDF document text
    • https://cdn.sqhk.co/sodovokak/aLifhii/fire_flames_live_wallpaper_for_samsung.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
    • https://uploads.strikinglycdn.com/files/5d03d460-3a38-4851-a91e-324ae93544a8/fobarimufuguxo.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/me_talk_pretty_one_day_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306ecb16-4b5c-4136-a001-7f0948604552/11980063154.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/dobufinubajufiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/mevuwigadog.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/35393183071.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/47722184982.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_off0000ebba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBA 5028 bytes
SHA-256: 39e588d7e402f4d92e3805de89fa0210410632654402d892ca58e376be3a6007
font_01_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 10992 bytes
SHA-256: 77d6f0719d265fa984ed8403ec56db51d52eaab9253ce9b4032c8cc242d878d1
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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