Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a82aa537a35307c…

MALICIOUS

PDF

77.8 KB Created: 2020-11-29 18:03:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 18bfa89353cb082fcbd693ac598dbca5 SHA-1: 47d32f4e1335d98faf8269b7e6e4b425b6a2e59d SHA-256: 6a82aa537a35307c79e62a1601a86ae726fccf3ca2e60d6adf475072a75939f8
214 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external PDF links, including one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of a malicious redirector URL and the overall structure suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/123?utm_term=don%2527t+count+your+chickens+till+they+hatch In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_5faa1072ef337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fbbbbe334880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_5fb562e999275.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.pdfIn PDF document text
    • https://tibaxasunoz.weebly.com/uploads/1/3/4/5/134589804/1aa10901.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/b6340274-9733-450d-9e49-4d7352ef1147/scavenger_hunt_clues_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45cf40fc-f00a-42a6-b5fd-f53f57baacc4/76306388748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a8a764-b36d-4a9e-9eba-0a15826d9902/iskcon_desire_tree_bhajans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/245f969a-c1f0-4909-8eba-bc8c7d96ead3/62175773500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b837a0-0631-423d-beb3-c984d8924b95/93847438551.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/74003410709.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/xutafigugibesewuvire.pdfIn PDF document text
    • https://s3.amazonaws.com/xapota/bluetooth_keyboard_for_android_samsung_tablet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 5872 bytes
SHA-256: df3c5440c5dda10ddf0bd2b5df3ac9bb90db508ede05ddbc6d2dc27f4f87e9ff
font_01_sfnt_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 5084 bytes
SHA-256: 60c17cef12e4563b845b288e79c5e7518c70d189d9451bded74fddb0ecb48e89
font_02_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 10844 bytes
SHA-256: 078ae3d815320ddad67a7368276f5b7b3e2ddb9b9e1d341f5e8a0af9aa1796b3
font_03_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 16120 bytes
SHA-256: f32424ebcd90ca8b291b2e72b96f9654b31a856406b2b06f7152c46d4a5797a0

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