Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f85ec068578219…

MALICIOUS

PDF

79.5 KB Created: 2020-11-27 19:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3edb74691ac8419ef7f5ba50bfa47aaf SHA-1: a93a4c375b79d3a1a715ad0a207a9a55dc5e6aaf SHA-256: 17f85ec06857821938f7683033690e5951026be91336072a5b30c4635cb33abc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a phishing or malware distribution scheme.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/aws?utm_term=alto+sax+star+wars+cantina+sheet+music PDF link annotation
    • https://nozudasukexip.weebly.com/uploads/1/3/4/4/134441991/7554707.pdfIn PDF document text
    • https://xojuliwujugiseb.weebly.com/uploads/1/3/4/3/134388488/wewexoxaj.pdfIn PDF document text
    • https://xulejodamujodu.weebly.com/uploads/1/3/4/7/134771271/7178cc3db814.pdfIn PDF document text
    • https://fikenetefi.weebly.com/uploads/1/3/4/7/134771518/6841114.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/duvijodetan.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/d1fa50eb8c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/237fb87d-f73b-4a66-bb2c-eecc06be022e/67172264179.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/28850902050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b640428-e2c2-4f8e-ad1a-784e1fb5aef2/ligobapolumupevefirijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bdc241-8a6a-45eb-88d1-30e616fa27db/vinagolepagiwutixidaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91cc26b5-0127-44dc-a793-bbffd05d3592/51282540190.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/vimize.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010a67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A67 22540 bytes
SHA-256: 86b09b97dc4a7aec298136b42952031e460b39f2493c3a3ca400ac558ea0adf9
font_00_sfnt_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 5188 bytes
SHA-256: 3e0bf3acdb0e9c69308cc081bb94119e061ef9e9a5847154915466846cd64bcd
font_01_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 11232 bytes
SHA-256: 9fb8a6d0974b25e2b387ed4bbd7811f0518294d8dba0553f12bb51111504c02e

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