Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c500b67512f8d78…

MALICIOUS

PDF

66.9 KB Created: 2021-01-02 18:48:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 33bfcb0280ff1797bd3e6feade80b590 SHA-1: e8887c8e7ec4286ddb4516b60ac68c28ae220acd SHA-256: 5c500b67512f8d781aea93261948af2fc07b14b37321a8d9eba5c9d1c31d7be1
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate a PDF link farm and a malicious redirector, suggesting the primary goal is to drive traffic to malicious sites. While no scripts were extracted, the presence of numerous links and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

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
  • 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://traffking.ru/123?utm_term=briggs+and+stratton+550ex+140cc+manual In PDF document text
    • https://cdn.sqhk.co/pewovixosafu/hgLNhi9/allegiant_movie_part_2_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/ymghrjj/online_business_ideas_for_stay_at_home_moms.pdfIn PDF document text
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/bf71290c135c.pdfIn PDF document text
    • https://juxupadozimufa.weebly.com/uploads/1/3/4/3/134388451/xuwasafirivu.pdfIn PDF document text
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/xomezipowut.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/eebb9bec-8522-47b1-a491-5b6d0b6363bb/33289557069.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/kiwifibewex.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/granny_smith_latest_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/47965130789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3404b72-b598-4f72-8397-b63d412f208f/10819429959.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/carboxylic_acid_and_esters_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/speaker_knockerz_count_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5d79c4a-b750-413c-b20b-924a27a88c22/xopemi.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_off0000b8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E0 5664 bytes
SHA-256: 395f146b2b4cbe2d9d316017110caa66b41440ee9d5d19c96e379bb19b9993d5
font_01_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 10708 bytes
SHA-256: eff3e579a4f88cb0e10c3bf144ed7092b868fdf276408a9d20ebbf3732db0eda
font_02_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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