Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaedbc6ed3c7f4f9…

MALICIOUS

PDF

77.1 KB Created: 2021-03-15 23:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d6aeb784b7e93ba2a2f91eb4d0c33f3 SHA-1: 12922faed50ab3d2ff419c63712ff82a7d517776 SHA-256: aaedbc6ed3c7f4f9bab6e417acc92f397f5bfe1f57dc28341c47958b2156d7c7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are likely part of an SEO link farm designed to drive traffic to malicious or low-reputation sites. The primary URL, 'https://maypoin.ru/award?keyword=postpartum+depression+articles+pdf', suggests a lure related to health information to attract unsuspecting users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=postpartum+depression+articles+pdf
    • https://nexuragero.weebly.com/uploads/1/3/4/7/134751893/9975426.pdf
    • http://dayzcommunity.info/tidawowonasoyc9oe.pdf
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/kiwejajotilami.pdf
    • https://jaxanotev.weebly.com/uploads/1/3/1/1/131164383/f49d0a534256424.pdf
    • https://cdn.sqhk.co/pelotuwew/iaL7Kig/15200241343.pdf
    • http://kittyplay.online/john_deere_9500_combine_horsepowerhv1dp.pdf
    • https://cdn.sqhk.co/ronofumito/heLCwgg/dead_zed_3_y8.pdf
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/3333736.pdf
    • https://fajizaxaro.weebly.com/uploads/1/3/1/3/131381717/zufarenolifun_metojurazarod_taxov_sumuguworerele.pdf
    • https://sukorason.weebly.com/uploads/1/3/4/5/134578332/9803939.pdf
    • https://genizeregadivov.weebly.com/uploads/1/3/4/7/134709948/warofesinum.pdf
    • https://famojiwogupoj.weebly.com/uploads/1/3/2/3/132303340/5360656.pdf
    • http://1ux.site/mepijemefefikipavy1y9q.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jedaxopopuko/atoms_molecules_and_elements_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/7ef3736c-83e5-4efe-83b6-f9ed76a4a1b6/89349454058.pdf
    • https://s3.amazonaws.com/laginekux/77268977462.pdf
    • https://uploads.strikinglycdn.com/files/d341f1a4-3c69-4c0f-a2b5-88106ce0bfb6/11324224457.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/food_handlers_card_practice_test_answers.pdf
    • https://uploads.strikinglycdn.com/files/a885a357-042e-4851-ac30-8df908ce0ff4/autocad_civil_3d_2013_tutorial_free_download.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_off0000f028.bin
23f536dbc3e89c13e8bfccaf47a42e6c2aab54045d88e87758e01bf470a22121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 5300 bytes
font_01_sfnt_off00010218.bin
1c4da44c8e383baa0b04eb405420a8f2c2c2691385c0bcdaf017c4c97a454bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 11004 bytes

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