Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3e819181a01fd9…

MALICIOUS

PDF

75.7 KB Created: 2020-11-28 19:08:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ed7190d8b1014811272bd0022c4ec877 SHA-1: 15cae2f2e4b99ff477c82f692959b92f42fd5d23 SHA-256: 0c3e819181a01fd9e06522eb639fc12b7ab99d92c856d2acaf2fa3fd79458488
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/aws?utm_term=website+design+free+templates In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5f8b656f803ce.pdfIn PDF document text
    • https://nevitasez.weebly.com/uploads/1/3/4/3/134305442/nuwuf.pdfIn PDF document text
    • https://motutipe.weebly.com/uploads/1/3/4/6/134674000/3528766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_5f8c70daaf408.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://s3.amazonaws.com/lodazojamuva/utilitech_flashlight_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/89591061125.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/bevexat.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/nandog_pet_bed.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/gusivazaxijoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ade51172-a7ed-44d1-b16f-9338c842d23a/29629854572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db87ea92-9015-454c-a2ec-6627c08b18b2/bikaromoduju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55140788-9ac7-4e51-8a90-539410082c31/1995_isuzu_trooper_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/masigolofovuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08b70dee-5980-4f24-ad40-0681ecf1ad0a/6251677290.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_off0000de97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 5192 bytes
SHA-256: 94ee68a6564a8e43f9beb26ccbfb743819f8af54b9accc4600135d02d3299a65
font_01_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 10508 bytes
SHA-256: 7391075d4fe3b4cf92d760b7816b853059c579f04c9d496a57fb4fdd30fe6a91
font_02_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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