Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc1a0e7a27a72a7…

MALICIOUS

PDF

78.9 KB Created: 2021-03-24 20:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6c1470403cde08906ca22402f86585a7 SHA-1: a32651782bb0f9e7e6c8073c65ab855f8a98d9cc SHA-256: 6bc1a0e7a27a72a78b8df51f105ae602d7c397a83832ea6ed11af45aff5a1ee7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated, but the presence of external URIs indicates an attempt to redirect the user to potentially harmful content. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

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://jumiwimov.ru/wix?keyword=pride+gogo+scooter+manual PDF link annotation
    • https://gibejuta.weebly.com/uploads/1/3/0/7/130776113/5e7663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_60374a4fe89a6.pdfIn PDF document text
    • http://lisujaden.22web.org/brche_aufgaben_6_klasse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fdad4c710ec4.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/what_color_is_dapple.pdfIn PDF document text
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/9b4b9b402d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461766/normal_5fc9d6ee120a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426955/normal_5febfbd39b444.pdfIn PDF document text
    • https://zawuziwoju.weebly.com/uploads/1/3/1/6/131636930/lapadunanosip-jategalixaja.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/diablo_nintendo_switch_release_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426551/normal_5fffe7318b328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_729d7ca0825b47b890f3983d04ed662b.pdf?index=trueIn PDF document text
    • https://aa84fbb7-d3ea-4675-94d1-3a2d808898f4.filesusr.com/ugd/661a84_27f8f5fcfa354a0bbdb3a55373aa4d25.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_0d41aa1221a942e48d58c6419644defb.pdf?index=trueIn PDF document text
    • http://gataluxogawix.epizy.com/34012173291.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/94970030628.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/pichuva_kathi_songs_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/73278583244.pdfIn PDF document text
    • https://0ffdd24b-620b-4f4d-94ef-a39da1ca20bd.filesusr.com/ugd/853ce2_9b564f8a1889414ea7cd88f4be35d010.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozore/sabibebudo.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_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 5260 bytes
SHA-256: e27d0cd9eb1e0f4c682d3b2e5d36194330c6d5b055374242240de3d51cb28bd2
font_01_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 11332 bytes
SHA-256: 583c9e8ae088712267585dec2786370cd71b011157328525d235496a617bfa50

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