Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ff0ef3276fa5de…

MALICIOUS

PDF

104.5 KB Created: 2021-02-18 13:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 65671c52751402aab0f87f05345b46c3 SHA-1: 4d1884f53df97781c8d80d4e11009cd30e62d3a5 SHA-256: a8ff0ef3276fa5de94bd297ad9d6f62b4a255d6d327690d445d7fc2ed3a7ce1e
206 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic firings, particularly 'PDF_SEO_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS', strongly suggest malicious intent. The presence of a malformed exploit stream further supports this, indicating the document is designed to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://seumenha.ru/strik?utm_term=dns-321+latest+firmware PDF link annotation
    • https://cdn.sqhk.co/jafetegupam/gcgdigu/47512337908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370062/normal_5fe80b04db2be.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/godopixovabab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5fdb2bb12ef88.pdfIn PDF document text
    • http://gratoramaa.website/exemple_diapo_rapport_de_stage3qtn0.pdfIn PDF document text
    • https://vifawadezak.weebly.com/uploads/1/3/4/8/134846548/muwovugipa-rivibagepudog-zapilikub-gitoguwipabale.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/xijekapidamixikizizu.pdfIn PDF document text
    • https://nidukonijeso.weebly.com/uploads/1/3/1/3/131381088/fikafaben.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/UnTxohd/gogatikafinasoporiniki.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/VijIEzG/12795506160.pdfIn PDF document text
    • https://beluloxepivizor.weebly.com/uploads/1/3/4/1/134131295/fetonulexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_60294c6764948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481418/normal_601735c22ec3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gezetega/flow_cytometry_free.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_off000156cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CF 5384 bytes
SHA-256: 9b401e30810f78ca7ac994251750a5ae9839535a02b55453aed39dea36693983
font_01_sfnt_off00016929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16929 13672 bytes
SHA-256: 557f871eb7eecca6cb2e8e2cad42d497f467871c250e3c1df7def733f64d9a8a

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