Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9070647f4db89da…

MALICIOUS

PDF

100.8 KB Created: 2021-04-22 09:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 68de2f253504c98d42ee43c3434c4c65 SHA-1: cafb2fdd6821c540608bee66a49f2df657a038c7 SHA-256: b9070647f4db89da8837d5e4a9901b4a887132fa77c9b1bcb02fedeaf0ae1279
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked URLs. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/strik?utm_term=kant+what+is+enlightenment+summary+sparknotes PDF link annotation
    • https://cdn.sqhk.co/duwenaxiseve/gfhdCkW/23073760594.pdfIn PDF document text
    • https://fodivavix.weebly.com/uploads/1/3/1/4/131483454/vuridozemipob-wusunu.pdfIn PDF document text
    • https://porojole.weebly.com/uploads/1/3/4/4/134462866/zuvoxes.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/gulonipupovit.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/Phdjdhe/fivb_volleyball_score_sheet.pdfIn PDF document text
    • https://monibobur.weebly.com/uploads/1/3/0/7/130776122/vubagiribele.pdfIn PDF document text
    • https://cdn.sqhk.co/wiradimabid/nxJigge/cnc_machinist_programmer_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/TTuc2j4/sky_rolling_ball_games.pdfIn PDF document text
    • https://cdn.sqhk.co/bofozuto/6mcXqut/lafoxaduvikeduxosalojira.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/jcrEgjs/32853009174.pdfIn PDF document text
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/9167502.pdfIn PDF document text
    • http://rulonoxoso.iblogger.org/29468956403.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
    • http://kinefinukabel.epizy.com/vofugoxada.pdfIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_d09b8d81e1f54ed693a9d153554ef825.pdf?index=trueIn PDF document text
    • http://lukoleni.epizy.com/crosley_turntable_motor_not_working.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_5cdf881d72ad4d5ab824f5640713b8ff.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_ffeeb776d6d2479d80bfdae9f7686932.pdf?index=trueIn PDF document text
    • https://73808e0e-d5df-4584-b63e-1552d949bc0c.filesusr.com/ugd/8d2ea6_3c92a10aae6843fd9c6a3df2c8045caa.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
    • 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_off000127f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F4 5344 bytes
SHA-256: 95ad82e4fdaa52d8cbb30d110c5af76357409ce512c24d96a405db52c4f679b0
font_01_sfnt_off00013a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A08 11132 bytes
SHA-256: d23e630ec56bc26ac7548b7531fc9ff05d77a2ac0286e17c5b7866d7ce3f1964
font_02_sfnt_off00015fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA5 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off000174d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174D5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34