Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed6506b498ef915…

MALICIOUS

PDF

79.2 KB Created: 2021-06-09 09:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaaf307555d6a6503c6b3f7af589f2c4 SHA-1: e267a423feb318f5dcb8c4615df9deb47c58db67 SHA-256: 7ed6506b498ef9158d3a9e8d55ed1e0cfce37c99a8f1594a3b96db84a7ff2956
156 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 link farms, indicating a likely SEO manipulation or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, with the embedded URLs likely serving as lures to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://catamma.ru/pbw?utm_term=metrica+y+rima+ejercicios+resueltos
    • https://kugavibutatabo.weebly.com/uploads/1/3/4/6/134613496/703c4.pdf
    • https://velizixevapejaj.weebly.com/uploads/1/3/4/3/134376636/tadebalugujob_tezinenuwabupig.pdf
    • https://buneruwig.weebly.com/uploads/1/3/7/5/137512718/1417564.pdf
    • https://waripeseditalas.weebly.com/uploads/1/3/4/0/134012866/bujadazoborewidafi.pdf
    • https://sinekamawo.weebly.com/uploads/1/3/0/7/130776883/1620589.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pudomasepok.pbworks.com/f/niwevunepew.pdf
    • https://uploads.strikinglycdn.com/files/b1460caf-fb27-42b6-b5e9-e183b2ad3f0f/gone_from_sight_the_dying_experience.pdf
    • https://uploads.strikinglycdn.com/files/42206fb6-f045-46fb-a4ab-0fa162bdb934/xareweluzewipibejunajefe.pdf
    • https://uploads.strikinglycdn.com/files/e40727fe-8940-4489-8615-9f55ee3742af/woliti.pdf
    • http://bekivuxuga.pbworks.com/f/watch_free_full_movies_no_sign_up.pdf
    • http://nagomax.pbworks.com/f/which_irobot_roomba_is_best_for_me.pdf
    • http://sijomirurefi.pbworks.com/w/file/fetch/144629904/amazon_case_study_harvard.pdf
    • https://uploads.strikinglycdn.com/files/98c47182-ba2f-4882-a58b-b77af946b48f/jodijesixed.pdf
    • http://nadupodifado.pbworks.com/f/99112906187.pdf
    • http://rugewenuzed.pbworks.com/f/70128593060.pdf
    • https://uploads.strikinglycdn.com/files/3d5d83dc-4362-4619-9c4c-5c7c00f87a53/18488771001.pdf
    • https://uploads.strikinglycdn.com/files/e54e5ec8-c4cc-401c-8d39-cd89ab34846e/15164506775.pdf
    • https://uploads.strikinglycdn.com/files/bb6cd38a-f327-4b60-b4ae-0c8c5dd837b2/81236221881.pdf
    • http://nosegawibaso.pbworks.com/f/bruno_mars_marry_you_video_download.pdf
    • https://uploads.strikinglycdn.com/files/b4be5144-cf9d-48ac-87dd-94f25cdcf0ed/55148682516.pdf
    • https://uploads.strikinglycdn.com/files/126a90f0-047c-4e89-abe4-b0524668339b/xenanekop.pdf
    • https://uploads.strikinglycdn.com/files/93cd8d4d-acde-41d7-851a-5efcf5abe9b3/mp3xd_musica_gratis_para_celulares.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f541.bin
a97754eea61425e73b3bc6513b6e14f3cc725a91e65b9730b842282607b038ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 5128 bytes
font_01_sfnt_off000106ae.bin
ed7279d01bdb32efc9b84e343aa444905caafe9c6e3c27e503622b47a66ba088		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 12180 bytes

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