Malicious PDF — malware analysis report

Static analysis result for SHA-256 b85e2ef0626373f0…

MALICIOUS

PDF

76.8 KB Created: 2020-12-18 09:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 971e66a99e5a8b8239187bbdb73f89ff SHA-1: 97ced6809be20856ef58b83760f28a398355f000 SHA-256: b85e2ef0626373f0bb08543f4de4de0bf67872b810d51c99c59007676614a26e
254 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and a link farm, including a critical finding for a malicious redirector. The embedded URL, 'https://traffine.ru/123?utm_term=project+management+maturity+assessment+excel', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Project management maturity assessment excel', suggesting a lure to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffine.ru/123?utm_term=project+management+maturity+assessment+excel In PDF document text
    • https://bafumujem.weebly.com/uploads/1/3/4/4/134498711/5536910.pdfIn PDF document text
    • https://xebagaxasu.weebly.com/uploads/1/3/4/8/134878678/92db5.pdfIn PDF document text
    • https://korumarivaz.weebly.com/uploads/1/3/4/5/134506991/4581514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f9fda71d86ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe02ec9b1ed03538a1464a/1606288110195/abstract_nouns_worksheet_for_grade_3.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1d263c02f22b9dd5f22a/1606294823513/second_class_petty_officer_association_bylaws.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27166ea3-1891-494a-9793-79af800429f1/16283538650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8415f86a-b3bf-4149-9c43-1443c16cdb9c/51389758860.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c362403f5353fd950a5e/t/5fc1036e1972c46e3cc2782e/1606484846571/vatigenakub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39aa09f2-f1a8-4e02-b725-28670e3b00f5/95645437983.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e2ed17e7202640ea1bf0/t/5fc15984fa04221c71522bc5/1606506887169/jixasokurofonitidibon.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc13e7dd49dd12447366960/t/5fc3b26c6457125654acbf0f/1606660718045/wheels_of_life_anodea_judith.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47d4e63-da24-4d6d-934d-c6461b3681b6/racor_2020_30_micron.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe330fcb3e0f577119561a/1606300431546/sotarepezatozog.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_off0000d572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 7232 bytes
SHA-256: 8a3478caf94d08a53d851c04f51cbc3b4c672bf26ab2e63958c1712a258907c6
font_01_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 5368 bytes
SHA-256: a97b80590607d768fb7c33b9fe6d09603c73429a900589b1ba208f82ac8767a8
font_02_sfnt_off0001003c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 10884 bytes
SHA-256: a7608a88ac501c39f0c37e4080da9dbf242cc6eb05720e58078e4bfc27758867