Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d96e15e86df9fc…

MALICIOUS

PDF

92.6 KB Created: 2020-12-07 18:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2484c1df4131ac8a3f56e73747e7bc28 SHA-1: 25be31220d8c2048682c59f7dcf9514da0b1ade9 SHA-256: d1d96e15e86df9fcda7625dd2d8c87caee15d49c304833ec4fb98b2238c797b6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://trafftec.ru/strik?utm_term=research+articles+on+english+literature+pdf PDF link annotation
    • https://pitajuzijos.weebly.com/uploads/1/3/4/8/134885257/9475552.pdfIn PDF document text
    • https://rozolabo.weebly.com/uploads/1/3/0/8/130814594/jajudavigiw.pdfIn PDF document text
    • https://dotadokox.weebly.com/uploads/1/3/4/8/134883209/cb71f9b78.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/418368.pdfIn PDF document text
    • https://fibuwuvonej.weebly.com/uploads/1/3/4/2/134265895/888ed9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_5fbbc4abbbe6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5f8f8762d6cd6.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/2323367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fa27475c5bb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387573/normal_5f95df9ee6518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5f90ef1ad64b1.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/af26a5ac-752c-408d-82f0-ea7c510ab824/bray_terminal_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e95148-794b-4572-9b22-13fdbbd9e1df/98499725120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff097f03-92b4-49e8-9533-613c0b16c2a8/68517241624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a26d43c-e908-43d5-aa21-d8ec303d6dbb/tunob.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/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
font_00_sfnt_off000111bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 10352 bytes
SHA-256: 82e9203dc131930ef0be624f98e3e5eb5c0fc467929d20cc9832aa3901492fa5
font_01_sfnt_off00012d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D57 5424 bytes
SHA-256: bec081b7eb6a03ce5f735094f62fafaee5d2eb5ccf8796e30d39a565f006b5c4
font_02_sfnt_off00013fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCE 10976 bytes
SHA-256: 2e170c98db392300bee7bf03c60d559c6e330f58851f0db241f17be52cd940aa

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