Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f340db4813e7241…

MALICIOUS

PDF

115.5 KB Created: 2021-05-24 11:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bd57d1e847f80b54a685b515507fce24 SHA-1: 87c3a425315540d6a5c3ead66e7292afe27812a6 SHA-256: 1f340db4813e7241bb914ac6a6b883ae1f191404d8b8ba231653d4e8da9e6867
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to redirectors and SEO link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK point towards a campaign designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=porsche+macan+2019+interior+india PDF link annotation
    • https://fomememuvur.weebly.com/uploads/1/3/4/0/134000402/tezotipagiruketukak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412568/normal_6049f3d57013e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_606e565ce1104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475861/normal_5fd86a35addf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408336/normal_5fddd12d5f0a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460688/normal_603cadcf63527.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425738/normal_5fcd25ded3a7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495257/normal_6039b37788def.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_6063b6f620392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_60303b5a5c96b.pdfIn PDF document text
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/pogelajosejop_sotatuvobe_lubazetema_vosaxeji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416125/normal_6007ee03e9b54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370278/normal_606d5f3cbc278.pdfIn PDF document text
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/ad37a743c.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/2187868c-9bbb-4aef-b99c-0a4a2d7574a7/33920894993.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/maledubogidaloz.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/zasip.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/valenopoxofalakexesuxan.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/getting_started_with_latin_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da60cded-1be8-46f4-91ae-0c23ec7884d6/8951699168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/727cb36d-fdfc-46d8-86f3-e41618ba673c/92648238988.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000169a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A2 5628 bytes
SHA-256: b5882f1071c0724e236dc8fec65f208d4f97f7940b750ab1de118280fe6d7768
font_01_sfnt_off00017c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C94 14140 bytes
SHA-256: 556fc414ab93b167061bb1879855abd5044ae7a045f10f907c58876bf1e0314c
font_02_sfnt_off0001aaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAAB 16116 bytes
SHA-256: d53d347cea387c54c087b2cd85ea94373ed5f2f525a48ba1569850c62da8c160