Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5bc8e16dfa8ed62…

MALICIOUS

PDF

66.8 KB Created: 2021-03-03 14:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d3cc0e3a556f7ef46c678e01941e0b47 SHA-1: 76f74b19beff1ba6b7ba514a8ac5062fb30dc5bd SHA-256: a5bc8e16dfa8ed62c30f9a07d46f536a70d2773055940bec06dc2c6db1633681
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/award?keyword=life+pharmacy+al+qusais+dubai PDF link annotation
    • http://fujuvujazapoko.22web.org/tamil_dubbed_bollywood_movies_in_tamilrockers.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/quahdhm/78917299206.pdfIn PDF document text
    • https://migigagabigugam.weebly.com/uploads/1/3/0/7/130775968/vopulo.pdfIn PDF document text
    • https://molefagis.weebly.com/uploads/1/3/5/3/135311004/4a002.pdfIn PDF document text
    • https://cdn.sqhk.co/dabeluza/ifhbifD/falulejugusadebozi.pdfIn PDF document text
    • https://lejalebenepuk.weebly.com/uploads/1/3/0/7/130776022/maromipotazesegawir.pdfIn PDF document text
    • https://vobogokofudukig.weebly.com/uploads/1/3/0/7/130775751/jokekawonakit.pdfIn PDF document text
    • https://rolurenogilu.weebly.com/uploads/1/3/4/0/134096536/bakojonev-bujimafeloba-revedukoge.pdfIn PDF document text
    • https://zokesafan.weebly.com/uploads/1/3/0/7/130775675/katijunodu-fesim-wiruwep-xederu.pdfIn PDF document text
    • http://rigipufefe.iblogger.org/xokuwoxedimu.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/how_to_statistically_analyze_survey_results.pdfIn PDF document text
    • https://vavixadejimu.weebly.com/uploads/1/3/4/6/134650619/08d4638bb03e8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinozireru.epizy.com/64398785097.pdfIn PDF document text
    • https://help.2gis.ru/feedbaIn 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_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 5704 bytes
SHA-256: 9c6676bd751bccbb8aaab6dca9ed597b46455185ae12a8fb6d4898b4b89240c4
font_01_sfnt_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 10140 bytes
SHA-256: 275f5fa0defa116a332c972dc6a43c4deb822c9319e66cfe487116af225e0770

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