Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fbdc18af64ad5c…

MALICIOUS

PDF

72.7 KB Created: 2021-03-16 22:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3d7b86cb73009a845c1f823fe52c2f40 SHA-1: 50dc3d756402f9b1f1ac29f75c354f709755bb67 SHA-256: b6fbdc18af64ad5c40bb674a6809ec30d67fab2aff7e9ddf3456c63c6af677fb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. One of the primary links, 'https://vilenefex.ru/123?utm_term=encounter+shankar+flute+song', and a significant number of other PDF links on disposable hosting are indicative of a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/123?utm_term=encounter+shankar+flute+song PDF link annotation
    • http://nenidegelivon.22web.org/durijikimurajigol.pdfIn PDF document text
    • http://reawolt.online/how_to_get_yeti_microphone_to_workxe1nl.pdfIn PDF document text
    • https://vobemebu.weebly.com/uploads/1/3/4/3/134383317/7ec6d76b52.pdfIn PDF document text
    • http://nijuwebil.iblogger.org/download_using_blob_javascript.pdfIn PDF document text
    • http://closemaze.com/juki_ddl-555-4_instruction_manual9v7l0.pdfIn PDF document text
    • http://bijavamu.iblogger.org/biribola.pdfIn PDF document text
    • http://nijagegedok.22web.org/vuginupuwurotid.pdfIn PDF document text
    • https://baxemajoxololur.weebly.com/uploads/1/3/1/0/131070692/tebunaz.pdfIn PDF document text
    • https://zipusuborulam.weebly.com/uploads/1/3/0/8/130814510/f4a03a.pdfIn PDF document text
    • https://zarimuxeve.weebly.com/uploads/1/3/4/8/134897304/vesubinodogufogizo.pdfIn PDF document text
    • https://najatiruz.weebly.com/uploads/1/3/0/7/130738831/6144017.pdfIn PDF document text
    • http://tophomework.space/download_music_mp3_files_free_onlined3ab7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e4dd5bf8-bd13-43e3-b37b-9624b2564f03.filesusr.com/ugd/093416_427a5f7ff9b144b2a17e59450a5b5419.pdf?index=trueIn PDF document text
    • http://jabisuluro.epizy.com/beats_solo_2_wireless_not_charging.pdfIn PDF document text
    • http://delorikafuba.rf.gd/jetak.pdfIn PDF document text
    • http://vusevupitiwo.rf.gd/guxarekedenaz.pdfIn PDF document text
    • http://bokakemipik.epizy.com/walazoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59214946-5c65-4f96-ac85-917d55ea993d/wunokoxozebupaxazoseluz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/949bc998-0d28-4a61-ba05-a7831c27a201/nosamojogaxepadozerekabud.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_218e4d48187b4132adbe626d9ad4bc01.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/263b2e1e-3fb4-4e70-aa86-fbf7f0fcb49c/zopukozaridaderezowewas.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_ba3a34a459484bfeb3f22f221eb0e3b9.pdf?index=trueIn PDF document text
    • http://jiguluvosasibun.epizy.com/vidmate_hd_video_app_free_2.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_9d0690fe5b434c84a36352f63c4940a9.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F8 4996 bytes
SHA-256: 114d665cc748834fb12a03418f49d23af06553875e37b14db58dd9ac9f7f153d
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 10408 bytes
SHA-256: c5a580456dc7ee3d4651a5678596ab32333241df23e39a42deb5430a38500481
font_02_sfnt_off000106af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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