Malicious PDF — malware analysis report

Static analysis result for SHA-256 a845bb8f56fa0fa7…

MALICIOUS

PDF

70.5 KB Created: 2021-03-01 21:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f9e089b20d7b710e308b465c57ee5305 SHA-1: df9476566a6af58d416873c208898d6425ea1612 SHA-256: a845bb8f56fa0fa7c47074f431ec390fd8b34eafc77670c3030dfc14de194e89
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. One of the extracted URLs, https://pelibifir.ru/strik?utm_term=how+to+use+the+bissell+proheat+pet+cleaner, suggests a potential lure related to product usage, which is common in phishing or scam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+to+use+the+bissell+proheat+pet+cleaner PDF link annotation
    • http://lunatan.medianewsonline.com/how_a_bill_becomes_a_law_philippines.pdfIn PDF document text
    • https://waxajevigeko.weebly.com/uploads/1/3/1/4/131453715/1326348.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/djehhig/19232888662.pdfIn PDF document text
    • http://pikaromabunoteb.iblogger.org/32770602163.pdfIn PDF document text
    • http://yarrebitteh.online/1._mouawad_1001_nights_diamond_purseb0xkj.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/fF4igaZ/crossy_road_download_macbook.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleratupo/ihbHqZu/resident_evil_movie_reboot_leon.pdfIn PDF document text
    • http://timinome.getenjoyment.net/japanese_words_written_in_english_letters.pdfIn PDF document text
    • http://wordsideget.top/19195320452dwklt.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/giigdMN/birdy_skinny_love_lyrics_ubersetzung.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/bevifivetidamumasedeko.pdfIn PDF document text
    • http://kitafoged.medianewsonline.com/jedunamisudujufevu.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/32247275161.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/26152231c.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/4258307.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 5212 bytes
SHA-256: 928ed86dbc9cf8ce7b47274994671e91261f2e42155b6b3128e62ce23f9ecf28
font_01_sfnt_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 10248 bytes
SHA-256: a1ad952616b56ebbe16f210a80588e3b1f95ed734c055cc4ea80d31f30ea2c60

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