Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc43f66f904ad75b…

MALICIOUS

PDF

74.7 KB Created: 2021-02-23 23:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 1bc78adb3d9a6038e53cdee775de1953 SHA-1: 2a0ffb40710a68496816cb1255b5b465eb9bb6d6 SHA-256: bc43f66f904ad75b213d25e0b2d73827a4dabe7f1bf9a94b21d524115c760f6b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and hosted on services like Weebly, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URI and link farm heuristics point to the document's primary function of redirecting users to potentially harmful external sites.

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
  • 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://maypoin.ru/wix?keyword=nth+term+formula+for+arithmetic+sequence PDF link annotation
    • https://cdn.sqhk.co/kagalitisup/eigfZji/bulleit_blenders_select_for_sale.pdfIn PDF document text
    • https://metidesu.weebly.com/uploads/1/3/4/4/134492072/9701060.pdfIn PDF document text
    • https://ropupapufodugut.weebly.com/uploads/1/3/4/6/134650221/744c4a.pdfIn PDF document text
    • https://xonifosanonozo.weebly.com/uploads/1/3/2/6/132680915/susizasamod.pdfIn PDF document text
    • http://fexewivu.iblogger.org/bootstrap_admin_template_open_source_github.pdfIn PDF document text
    • https://viwukafum.weebly.com/uploads/1/3/0/7/130738591/janukukurutax.pdfIn PDF document text
    • http://diziretojiz.iblogger.org/81706341040.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466676/normal_5fdf8cf7bf492.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/gejgh0k/jebow.pdfIn PDF document text
    • https://xoravali.weebly.com/uploads/1/3/0/7/130775395/xatuxegu-joliv-rebosija-vukir.pdfIn PDF document text
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/zekiketavaja_todigopunavewes_fojubez_munezekuv.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/FLQjiif/71038061850.pdfIn PDF document text
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/paxufakalugepaf.pdfIn PDF document text
    • https://sujarazigis.weebly.com/uploads/1/3/0/8/130813042/2259693.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vufagozujidivu.epizy.com/betoduxetawabapadiva.pdfIn PDF document text
    • http://pubupamosala.epizy.com/sudurapudefusoxugu.pdfIn PDF document text
    • http://wiwesokowam.epizy.com/metformin_er_500_mg_osmotic_tb.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_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 5216 bytes
SHA-256: d3e6940ae72e93b3370bd3c5cac0c7f187cdcc1de5a513985329340bc6fef4f8
font_01_sfnt_off0000fad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD1 10136 bytes
SHA-256: e065524da7f6870c80c5a83553b2760e9a75f5d0f04ea9fa187ef5967ff80e7b

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