Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71673b0e7b297de…

MALICIOUS

PDF

75.3 KB Created: 2021-05-24 20:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e192b10eab8bc6009526e255b2cd65e7 SHA-1: f94af8bfe1dd629fb4995736ef24f627e99e0fe8 SHA-256: a71673b0e7b297dec4f559a63cb5164a7e62eb1a44480b99e49f73ca07c89b46
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDFs, suggesting a link farm for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to movie downloads, likely a lure to entice users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=avatar+full+movie+in+hindi+download+1080p+bluray PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478146/normal_604158b9abf3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_6031e07defc65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_60241aeb00a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_60151c5c2537f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_6052f5ed5de73.pdfIn PDF document text
    • https://fiwofufoneronup.weebly.com/uploads/1/3/1/0/131071066/4470693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501660/normal_605b3e84d627d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_605df446a8437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414360/normal_6027c44cd7934.pdfIn PDF document text
    • https://jafoxexaromomev.weebly.com/uploads/1/3/5/2/135296472/xijabel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416502/normal_5fcf4d2322e12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385009/normal_5ffe8c2ac8f32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421210/normal_5fdc957dde581.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/vosimalume/lukuwetokewinil.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/gopomadajemir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20e5116-0e2d-4513-8b68-a72ca370035f/vekedogibutexuzowesiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67403659-964c-4a00-9392-fd427a92ab64/how_long_does_soft_serve_ice_cream_last_in_the_freezer.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/sql_format_function_month.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_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 5872 bytes
SHA-256: 9acba47909baf40178051a9246952664ebeab7744f663863f4b6e63d853a2ed3
font_01_sfnt_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 10676 bytes
SHA-256: 0281d33c0598964ea748fa18c9a7e5530692a52724d96798ee36bf6d920b44f7

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