Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a67825b8cc69e3…

MALICIOUS

PDF

131.8 KB Created: 2020-12-31 19:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9e73c20efab7c6a8dedc67b3dac13d64 SHA-1: 970d2bfbf50e016df7a7e5c2060377a94ae16752 SHA-256: 35a67825b8cc69e3398e3c554ab55810b0c7b626ecd5e23df94136588d104d0f
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO redirectors, including one pointing to 'trafffi.ru' with a query parameter suggesting a game download lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan delivery. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support a phishing campaign designed to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • 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.
  • 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://trafffi.ru/strik?utm_term=download+game+furious+8+drag+racing+mod+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407793/normal_5fa77df8ec092.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528780/normal_5fc7f2daa3ff9.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/tuvefuxudubowode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f93886b53ac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497646/normal_5fd60dd1e9270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_5fa26a9d6335f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412894/normal_5fc951c271f70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484994/normal_5fc3faddbfb8d.pdfIn PDF document text
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/68b8ff6.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/79c01288-c0d4-4831-b7b2-6cb814fcaf35/visions_of_canada_ferndale.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/72906693261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4b0e6f-cde5-4fec-b697-3d4d993c7f98/gowanetinupori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5bc1b18-7695-466a-ad82-e838ef3268fc/16748729347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d66841-81d0-4215-94b8-115c602a83ce/college_of_winterhold_quest_glitch.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/66533097322.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18703 3488 bytes
SHA-256: 02751bcd581385d414c8fd66ace06d992c55a21e539c3f3433e8ede7b61f217c
font_01_sfnt_off000192f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192F8 5824 bytes
SHA-256: 1a1d1d8c8f7aba151b71e17064e73356d78075c7c934fc7ae60f6724a8c60a37
font_02_sfnt_off0001a6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6D4 7640 bytes
SHA-256: 56ca8ccbe1d3fd4dda70df963e307d1751f694f28abd88997fa05f412950bf6c
font_03_sfnt_off0001c22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C22A 12088 bytes
SHA-256: 99baa02c1919f65a8f1ece3f8f2b250336d9f63528507643e8d37770042fde76
font_04_sfnt_off0001eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB5A 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67