Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d23f445c8c1076…

MALICIOUS

PDF

80.9 KB Created: 2021-01-05 04:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 737ce5ad71c29b66be291089ed60dbb6 SHA-1: 94c230035209b9cb280fd462b4629a1cf5a71655 SHA-256: e7d23f445c8c1076895d13b6bd1f2ff4b3731b4bfccdb098a6c1fea1c825372f
164 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 external links, many of which are hosted on S3 buckets, suggesting a link farm or SEO spamming attempt. One of the extracted URLs, 'https://trafftec.ru/aws?utm_term=game+guardian+latest+mod+apk', appears to be a lure for software downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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
  • 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
  • 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://trafftec.ru/aws?utm_term=game+guardian+latest+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365606/normal_5f87dc259ae78.pdfIn PDF document text
    • https://zobejonimofov.weebly.com/uploads/1/3/4/3/134354570/waruvunufewu.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/vexosafugunu/vemawadojobubojoxaxemubag.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/free_tri_fold_funeral_program_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/96147111879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3756abd-7709-4d3a-a5c2-8f1f79b5e313/60015162393.pdfIn PDF document text
    • https://s3.amazonaws.com/zojizu/45918535475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f325df-abf7-4f72-96e6-8edad95da377/exploring_the_brain_4th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9869057-914e-4346-a552-d577c0abb7e4/kohler_lawn_mower_parts_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/wrong_side_of_heaven_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcebb353-c3a1-4d08-9746-215116753b88/checkers_near_me_open_now.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/lonoveremimapumula.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_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 5372 bytes
SHA-256: 80fd0b6c27f1c5a6668bdb01c4e348a6c30216bb0ebecffbd88e847d19496009
font_01_sfnt_off0001131a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131A 10404 bytes
SHA-256: efd42a9b117a980e7de5993735434193b0308e5dfb768b37001cc2c474590bf5

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