Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb1d811e1247101…

MALICIOUS

PDF

90.6 KB Created: 2021-06-08 20:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 80096b2868422c5a0615203102369fb1 SHA-1: 3decc6b0a320295fdd308318351aa08701b7e61a SHA-256: adb1d811e1247101d5160c5a17517dedf1c34063cf41a5cfd4f600d246579ba2
186 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 hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://garglob.ru/pbw?utm_term=download+windows+7+starter+32+bit+iso', suggests a lure for software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/pbw?utm_term=download+windows+7+starter+32+bit+iso PDF link annotation
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/dimasatenepemas.pdfIn PDF document text
    • https://kazazurijufom.weebly.com/uploads/1/3/0/8/130814205/6760969.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_604ee5c6b28e2.pdfIn PDF document text
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/zumila-luwawubim.pdfIn PDF document text
    • https://xogoluxoso.weebly.com/uploads/1/3/4/4/134444279/72c19898ce2c3.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/8238025.pdfIn PDF document text
    • https://batarodev.weebly.com/uploads/1/3/1/3/131380453/2521272.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/1699044.pdfIn PDF document text
    • https://duxizesojisuvab.weebly.com/uploads/1/3/5/3/135327590/2cdeda6a5.pdfIn PDF document text
    • https://lakafirawitekir.weebly.com/uploads/1/3/4/0/134018328/1648418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_6015f31d2db9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496597/normal_6041bb8b4c38d.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/f6ca6dab-d39f-4c91-b7a7-4083246d7dc6/cybex_arc_trainer_620a_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9139f88b-33cb-4090-b22a-fdd09afd6a94/36550300754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554686ee-55d2-461d-a183-e8daafc4dcf7/pagika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45ddded-334c-4cf7-8a7a-a615429fc611/46279800347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc794eb-5369-4e9c-a81f-47db8e23656b/nuzizekulupun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e6608fc-136a-4010-8c88-77d7254b40ee/lyman_reloading_data_38_special.pdfIn PDF document text
    • http://tujezowosop.pbworks.com/f/x96_mini_tv_box_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a1e5f2-26ab-4574-9811-c20b14c65532/el_espejo_enterrado_fuentes.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/w/file/fetch/144460803/gaposofegopimuvudosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52a50f17-048c-4cc7-a207-76bd658cd60d/does_crossfit_make_you_lose_weight_fast.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_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 4820 bytes
SHA-256: c7e064e98560eb63e0cc3c2f5d81e1e3479c0a9ed75761d6bbff210477efae9c
font_01_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 5428 bytes
SHA-256: 1ee9a13dc4e448b5c44bf8b6ae21aa1451561e7e49a5d4cc9f185111c544b58e
font_02_sfnt_off000110f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 18328 bytes
SHA-256: 96e5f2bed8178ca70b2ad88d96ab7d1e28bce6adca7bb11a6a99170fcbee7494
font_03_sfnt_off0001417d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417D 16956 bytes
SHA-256: 314c6187a18cba2ebe04fc98bd90b8a084dea85b42341af247c5c0eeb743e6a5

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