Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f534f541f5a4bb…

MALICIOUS

PDF

72.6 KB Created: 2020-11-13 08:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 02981c66cb9aa3a340696c67dc31ffb8 SHA-1: 91da33316e7cc3eab53ca11be7100fe970d49c98 SHA-256: 31f534f541f5a4bbe4b62cfa56d5c5dc7b67ed8156e83779d0e42215fa31d96a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/aws?utm_term=diffordsguide+amaretto+sour PDF link annotation
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/f64cd4a1194af8d.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/dunijojivisilezuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_5f89655722dbf.pdfIn PDF document text
    • https://gigojajalul.weebly.com/uploads/1/3/4/3/134320096/gaxezuki.pdfIn PDF document text
    • https://jagamasukibo.weebly.com/uploads/1/3/4/4/134493784/ea9301f.pdfIn PDF document text
    • https://defejeve.weebly.com/uploads/1/3/4/3/134386135/985459.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/musub_noxevatug.pdfIn PDF document text
    • https://suxifobafip.weebly.com/uploads/1/3/4/3/134370270/8283841.pdfIn PDF document text
    • https://wejapofi.weebly.com/uploads/1/3/4/5/134590092/susezojaxisofa_pudaxasubow_ziguvolumulegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b675ce4e-7b0f-4daf-912e-26a6d864ad2a/tomogozozotopin.pdfIn PDF document text
    • https://s3.amazonaws.com/mupakijivuruzim/golden_sower_winners_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb5c1e5-0a6f-459d-8369-0a6be44c9902/after_effect_cc_2019_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4708f00e-d949-4822-b713-ce92a004631a/51754569953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d45545-7e2c-4464-b347-9e1eb6b60707/45921165494.pdfIn PDF document text
    • https://s3.amazonaws.com/kekunawi/97351093830.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_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 5192 bytes
SHA-256: f5ab9727536b50cb8c3871b222b699f16ea858979d8aab63cd9ad049264da6c4
font_01_sfnt_off0000f164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 10644 bytes
SHA-256: 7fa47b8e7c80ced039106c2c2c351cf2c7be43527eb960a089fec26f816f9429

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