Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4e34c643c44481…

MALICIOUS

PDF

72.6 KB Created: 2020-12-25 06:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 02cb76c0542c8ea51b7e17217e272175 SHA-1: 53b4415dcfe702ff301f737b0e6dec77bc8fb71c SHA-256: 0f4e34c643c444813ef9f72dad076102e87f7b4b7293d529e9480e0e1cd2b65e
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for an 'hidden video recorder apk'. The presence of multiple external PDF links, including one to a known malicious redirector, indicates an attempt to drive traffic to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=hidden+video+recorder+apk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5fe28b13314c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_5fd97a2ec17c8.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/3576377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5fa0d6eb26373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5fd344ee4a454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484632/normal_5fd3b95070b4d.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/wotodedaruzuk/14746823210.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/campus_politics_in_kerala.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/gse_smart_iptv_fire_tv_stick_android_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/95932761971.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/add_fractions_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/63165328452.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/tejeligewowubidigefafiri.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_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 4940 bytes
SHA-256: 77ea0c3f07b19435b54a6ae63067ba7223b4c5e18e94c95ec2bf5e666faf99a6
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 11104 bytes
SHA-256: 2df6b573d857373bf8c1b2b3f836d8de711b082f744aa080515d69f523e23fe4

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