Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b965421e5202db4…

MALICIOUS

PDF

72.4 KB Created: 2021-01-21 01:47:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a310f1f3269dbe9327bec92f6beca976 SHA-1: 2f221d20bb3bb16080efd79817e4aa186aecaa8c SHA-256: 7b965421e5202db476e7ea22a2622c5caa8cc5557a1425a7b26ca339a7594616
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to the document's primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/aws?utm_term=avg+full+version+2019 PDF link annotation
    • https://site-1172306.mozfiles.com/files/1172306/repost_for_instagram_apple_store.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_5fb6868c9625f.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/dgdPibO/battlepillars_multiplayer_pvp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5f9fe266ee25c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5fc639ffcd16e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5fa10350a10ab.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/juzatijagijonivazelu.pdfIn PDF document text
    • https://jotinebemoti.weebly.com/uploads/1/3/4/6/134681432/a1e2d5fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490127/normal_5fda517f328a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f8b7b5a51d09.pdfIn PDF document text
    • https://site-1246486.mozfiles.com/files/1246486/litabetiwasojigiketuxed.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/jijgn8E/77510480379.pdfIn PDF document text
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/3927321.pdfIn PDF document text
    • https://site-1178617.mozfiles.com/files/1178617/cat_ear_yeast_infection_contagious_to_humans.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5f9206a4d5dd7.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/gihbHib/auburn_new_york_post_office_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/5jiIOid/heroes_of_steel_rpg_walkthrough.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 5256 bytes
SHA-256: b616beec26f1cf9e24784f1622252aab4706d60b007b8b670956bd54c5f33115
font_01_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 10852 bytes
SHA-256: a085679f5d746b6dc3eee31de39b323fc9f8c67cde2662647bdc07e77e88abf5

Open this report in the interactive analyzer, or submit your own file for analysis.