Malicious PDF — malware analysis report

Static analysis result for SHA-256 8495c02bf896fe9d…

MALICIOUS

PDF

73.7 KB Created: 2021-01-29 06:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f24d478f249fd32875a4fdef1992aa0c SHA-1: 191f1fbc60248f6d773ad67d9d50d3308baf370e SHA-256: 8495c02bf896fe9de8ba7153476b9d9d51c06ac8d6042eeb1e577f6117fb0349
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its function as a link farm, containing numerous embedded URLs pointing to potentially harmful content. The document body, though heavily obfuscated, suggests a lure related to software downloads, specifically mentioning 'The amazing spider man 2 apk free download'. The presence of multiple links on disposable hosting and a redirector link to 'yafferge.ru' indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=the+amazing+spider+man+2+apk+free+download+latest+version In PDF document text
    • https://tetoxoji.weebly.com/uploads/1/3/0/9/130969306/807909.pdfIn PDF document text
    • https://wutiduxa.weebly.com/uploads/1/3/5/3/135300785/puzugabezopopamefu.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/gjekhbe/94830034911.pdfIn PDF document text
    • https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/9256967.pdfIn PDF document text
    • https://kigusokitog.weebly.com/uploads/1/3/5/3/135300221/vubogimof.pdfIn PDF document text
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/1164401.pdfIn PDF document text
    • https://xozilozevaloda.weebly.com/uploads/1/3/5/3/135391373/1c0c2c.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/hicDXVQ/pajipugofepaxufopukola.pdfIn PDF document text
    • https://dikubudekoguzo.weebly.com/uploads/1/3/1/8/131857294/0f100e92582.pdfIn PDF document text
    • https://linulozaf.weebly.com/uploads/1/3/1/4/131437298/709598.pdfIn PDF document text
    • https://bazopozetera.weebly.com/uploads/1/3/1/6/131637116/8888365.pdfIn PDF document text
    • https://sorunamupojiwek.weebly.com/uploads/1/3/1/4/131407183/todamitopijebo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jimavuzeladones.epizy.com/pakalamanolev.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/funcion_del_pancreas_endocrino.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/fikevajugelemoguvogerexod.pdfIn PDF document text
    • http://xatudoxi.epizy.com/sikaxaxetowe.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/jixikububijoze.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_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 5800 bytes
SHA-256: 0f2a6ac433c032aba4959269184d94a12f71fc75b6a7d7cfd360f170f6cdfed9
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 10616 bytes
SHA-256: 81a5bd349d7b56084ffea112fc4bebf55d2e335ef39a825095c512c4d26f7e06

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