Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5c2125ab15aa31…

MALICIOUS

PDF

77.0 KB Created: 2020-12-17 06:34:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e16df358dcd44b9f4f104c20d7c4a63a SHA-1: 67518a7a0c3d8e8f7cb887eef5baa358cfc5f2ce SHA-256: 7c5c2125ab15aa310bbb17ae96f4f7cc3980893a19a096c81662e6773ec185f2
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

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://ggtraff.ru/aws?utm_term=apache+solr++archive In PDF document text
    • https://zotadapavera.weebly.com/uploads/1/3/4/4/134483721/watadosefek_tubuvefe.pdfIn PDF document text
    • https://mizunawakore.weebly.com/uploads/1/3/1/4/131406356/laxerajona.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/8413775.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/budomabopi-sodigoxo.pdfIn PDF document text
    • http://www.opentle.orgIn 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/5fc676cd1452f90b7f0b4806/t/5fcb5abe6fd93023bc03a90c/1607162561445/jijogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35034c9a-1760-4606-bc19-4a5fd9b57e08/rock_and_mineral_field_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc646dc1452f90b7f09a774/t/5fd03070c0a29916a56303b4/1607479409557/rufebepupepupusajutolot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311d1ac6-d9e2-4bce-83c9-181a37284fa8/61931574297.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf55d85147b148042a26e8/1606374874099/nenibalavomefexidupepaxa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc532e1bda9c57a97da3ebd/t/5fcb26f121c0486e91902ace/1607149298246/66488269593.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f88bd26ff1194f740ef3/t/5fca58b0d9b89011df949130/1607096500337/57464770348.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fa26e2fce462bc8c54f9/t/5fc51557e6d49a06bb33eaff/1606751576155/polar_cave_mashpee_menu.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d959.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD959 14332 bytes
SHA-256: 481b9bc2011fcba5f9fed343fb6cf0df6b599336390fa24f41cffd321aab8ba6
font_00_sfnt_off0000c827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 5072 bytes
SHA-256: 4a82520ef897f1e97d441df97698a952d5dd290dfcc00ea615eb55457c782c37
font_02_sfnt_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 11172 bytes
SHA-256: 0c94bad492010ac6d7035bf00345607db8c56f0d58cc2ba0269f74a17246e251

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