Malicious PDF — malware analysis report

Static analysis result for SHA-256 7605347edbfb9c70…

MALICIOUS

PDF

84.7 KB Created: 2021-04-25 10:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 41e9bbcccee6438a79275eb6270f8893 SHA-1: c45fabc6a344bf3bfb3b75fc2c2b275b2746fd67 SHA-256: 7605347edbfb9c702eaa15ab110eecca03ea388cd70c99395b2270ec9c7c011c
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 pointing to disposable hosting, characteristic of a link farm used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=clarke+130en+mig+welder+wire PDF link annotation
    • http://biviloja.iblogger.org/tutorial_aptana_studio_3_espaol.pdfIn PDF document text
    • https://lejezazunogi.weebly.com/uploads/1/3/4/5/134583087/xujej.pdfIn PDF document text
    • https://takigufumugo.weebly.com/uploads/1/3/5/3/135345847/cd2bcdb886949.pdfIn PDF document text
    • http://vilopeg.xyz/tewetalavutedawafajufi98ha.pdfIn PDF document text
    • http://gutowofobujibos.iblogger.org/60528174251.pdfIn PDF document text
    • http://expo-kit.ru/how_to_be_good_at_actingm1rgn.pdfIn PDF document text
    • http://wildber.store/zizulozuleguzujzg44q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_a9b769241fe24030ad09b738eae77fa7.pdf?index=trueIn PDF document text
    • http://sipopos.epizy.com/active_listening_skills_paraphrasing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c1ec0e-a1bc-42ef-8157-a978fc718b77/laminedoviv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f9c3f0-9e02-427b-a38c-b31f7d428b8f/86896875508.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_96bc2de941214f5dbf7edcf806b8e1f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipinib/94498594794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05c6df3-16c4-495d-9397-7a011386c17a/97585516058.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_5bebdf215241453d83e67ea8f1babbdc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zukogi/tipping_point_liz_wheeler_review.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/sword_art_online_novel_19.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/19833819574.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_d8f92140d9274bd7a0fa4c6d25e3b086.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/931d3318-feaf-4d50-93a7-0d335bc985d6/12050594960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a0b177-de7d-408c-b08f-a782a126bb08/27805117285.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/gadineledif.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 5388 bytes
SHA-256: 8d407f3a314868434c8c75ae0b5423c5706ee38204a19cca955f98d17b5c0c52
font_01_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 11100 bytes
SHA-256: 154157b2637149a78f53964783ed13c498635776e67683c5e4e76f9d7b39dab4