Malicious PDF — malware analysis report

Static analysis result for SHA-256 478a562ddcd84e3b…

MALICIOUS

PDF

83.7 KB Created: 2021-05-02 14:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8eb1655187580089795e3f00c273b85f SHA-1: 912b9af8ed0bd170aadb7c6e22e7d5a5ada3b177 SHA-256: 478a562ddcd84e3b54c518bc77ee42bf3ea49d9fa0c6c03d0a8cd25d1dce3757
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, characteristic of SEO spam or phishing campaigns. The primary URL, 'https://resalured.ru/strik?utm_term=cuanto+vale+un+metro+cubico+de+agua+en+barcelona', suggests a potential lure related to pricing information, possibly to mask malicious intent. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

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://resalured.ru/strik?utm_term=cuanto+vale+un+metro+cubico+de+agua+en+barcelona
    • https://cdn.sqhk.co/naziwixolagu/WHm0ib8/1383008071.pdf
    • https://metaxifal.weebly.com/uploads/1/3/4/3/134311681/kelolitexojefaza.pdf
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/vigexevefavazu_todofetavu.pdf
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/daxugigojamabipe.pdf
    • http://opssmall.space/bernards_high_school_athletic_forms1e28q.pdf
    • http://merovew.xyz/32852256417qv0u1.pdf
    • https://cdn.sqhk.co/palezubifo/ibZmA64/wakopivu.pdf
    • https://cdn.sqhk.co/businaxidare/gQhgjCQ/mexican_restaurants_in_ninety_six_sc.pdf
    • http://ses-sanobrabotka.ru/what_do_the_waters_of_babylon_representtpko6.pdf
    • http://form-lnstagramcopyrightservice.com/farmall_h_carburetor_problemsmbtna.pdf
    • http://vereffka.xyz/traktor_pro_2_download_full_versionahg7s.pdf
    • https://cdn.sqhk.co/surikuzezun/6sZjcic/20158413867.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fapaga/72741109738.pdf
    • https://uploads.strikinglycdn.com/files/52f77610-d1b6-4b5c-9621-5d7c014b0635/16384692394.pdf
    • https://uploads.strikinglycdn.com/files/8fe6740e-24d4-48a2-98ea-18328a6e3e10/rabbit_hole_heigold_kentucky_straight_bourbon_whiskey.pdf
    • https://s3.amazonaws.com/kavalukato/putigekap.pdf
    • https://uploads.strikinglycdn.com/files/f69247c9-4760-40d5-9206-caeabc5cf28f/66316154556.pdf
    • https://uploads.strikinglycdn.com/files/5a4fc508-104e-4c57-840a-664b69cc4868/songs_from_les_miserables_film.pdf
    • https://s3.amazonaws.com/jamuluvuvava/kitchen_guidelines_regarding_hygiene_and_sanitation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f840.bin
297a6b23dee6fdfff643e7702d3e40959e4bcd0671ad4f013fc552ca8b8847f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 5188 bytes
font_01_sfnt_off000109d5.bin
ca1f015c3c5134139d7987fe683b641c8a0049fedc68d1707ee77888c4c24f19
pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 12064 bytes
font_02_sfnt_off00013136.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 4324 bytes