Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c5adf0827ffae1…

MALICIOUS

PDF

68.4 KB Created: 2021-02-13 14:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1baef1fff92d16df605cdc6b36f246c2 SHA-1: 3e52b64c07e2df938056658d1977288290d504ac SHA-256: 32c5adf0827ffae1b5e72140bc6bfcb4d117549ab808730e493f4f7901be582f
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one prominent URL, 'https://jottigo.ru/123?utm_term=harkins+prescott+valley+14', identified as a potential phishing or malware distribution point. The PDF's structure and the presence of many links suggest it functions as a link farm, a common tactic for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jottigo.ru/123?utm_term=harkins+prescott+valley+14 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502493/normal_5ff2f7368d36e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fe8da75e890c.pdfIn PDF document text
    • http://guzolupe.iblogger.org/87221999627.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/h0if4x6/musoduziwabife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489054/normal_60117e538759f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427498/normal_5ff5730cc215d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478125/normal_5fed1024a1b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_6013c512e0055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dofufiri/autodesk._2013._products._universal._keygen-_xforce_free.pdfIn PDF document text
    • http://zumozitaporoka.epizy.com/bebemugivaz.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/nidolofepala.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/retrieve_deleted_text_messages_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/farmacos_anestesia_geral.pdfIn PDF document text
    • http://tidomag.epizy.com/guided_transmission_media_in_computer_networks_tutorialspoint.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_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 5252 bytes
SHA-256: 529bc7130da53f6c33d6c5920a9c8a471d332061e381a0b10170e5580901749e
font_01_sfnt_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 11368 bytes
SHA-256: ef723158455cd37b1717c39afeea9d73fd9f243308e8b48ff05b376f6fa9cc8d

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