Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a7abac2d8c6370…

MALICIOUS

PDF

89.1 KB Created: 2021-06-01 14:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 40ddc716e3cfca7723d9203c4fbf2a81 SHA-1: 938d2058d2c47fe95753335c93faf871a0ca3bb2 SHA-256: 59a7abac2d8c63702bdd4569c87453f158207871222dab852f5bdb89bf985e5a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cructi.ru/pbw?utm_term=olx+pakistan+old+version+apk+download PDF link annotation
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/zatizuzize.pdfIn PDF document text
    • https://kikizesojumare.weebly.com/uploads/1/3/4/7/134718780/kuzunekix.pdfIn PDF document text
    • https://mizefubu.weebly.com/uploads/1/3/4/6/134637235/2189192.pdfIn PDF document text
    • https://futikixuvezat.weebly.com/uploads/1/3/3/9/133986242/4724300.pdfIn PDF document text
    • https://juwavade.weebly.com/uploads/1/3/4/5/134526694/silurapakusixulirow.pdfIn PDF document text
    • https://dikubone.weebly.com/uploads/1/3/4/6/134603537/rusaxej-loxibed-tekuparex.pdfIn PDF document text
    • https://soluvixam.weebly.com/uploads/1/3/0/8/130873975/modev.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/vamakatipakiwo_febegisitijeb_maxomosete.pdfIn PDF document text
    • https://dupukaradox.weebly.com/uploads/1/3/6/0/136015529/darememilirijexawuk.pdfIn PDF document text
    • https://turabebusaweni.weebly.com/uploads/1/3/1/4/131438207/b644cd.pdfIn PDF document text
    • https://lugafowak.weebly.com/uploads/1/3/4/6/134647172/51e46.pdfIn PDF document text
    • https://zadafudabujebiv.weebly.com/uploads/1/3/4/6/134672368/9172474.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/5abf8b7c-831d-4c85-9921-1b979b1033ac/butterball_turkey_fryer_xl_manual.pdfIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144453009/how_to_calculate_square_footage_of_a_corrugated_box.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/ai_football_ggo_season_2_episode_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c9467d-5a7e-44ba-9416-cf7b49ed1a92/80984993849.pdfIn PDF document text
    • http://jetipufagi.pbworks.com/f/51997877843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4885eb1f-439a-459a-9333-e289eab286bb/can_you_see_the_starlink_satellites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea1aa2e-9a11-4443-b240-b43a00403504/61048275409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b650b119-445c-42ae-aeb7-9be3bb526db2/qumi_q6_projector_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fddacb-1f31-483a-bc28-e8d7d9d92c39/ruvukexosojozibuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d67e8da-feb1-412f-8b4a-cb5e04953579/78982921968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618de643-304d-46de-9311-51b748a80f41/virus_granny_shawl_written_pattern.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_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 5264 bytes
SHA-256: c2ff7d49e82c7ef6d6f7bb622b281a7c4eefa943c87607fed5c8d6b98a57a5d1
font_01_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 1964 bytes
SHA-256: 1d18534733479c870a78c46a90b83ed8aff410c3511f6838c5b83347f92bfa48
font_02_sfnt_off00011789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11789 11584 bytes
SHA-256: 9a5b46cc51cd50d53584e3babc11343a8a5f88a8d9e80b358fdd436abd56d3bd
font_03_sfnt_off00013f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F59 16488 bytes
SHA-256: 05c75fb2ea3f2003f47bb55d39f8d555e801f36ea1c58802ce245b62fa0e6d18