Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a251cfeada4a7d5…

MALICIOUS

PDF

61.1 KB Created: 2021-03-01 18:45:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b499a1fe9265de163f6445fde493a3cf SHA-1: 281dfa0ac56eaf37ab1a26ff0c4441c807c4a3d0 SHA-256: 8a251cfeada4a7d55c66fdb89765c21be8a94c5c2c5472e1a6c1ea680d95247c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, indicating it functions as a link farm. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=hmmwv+operators+manual PDF link annotation
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/wijupomufejikoz-nezobekepukufi.pdfIn PDF document text
    • https://zitipijasidigor.weebly.com/uploads/1/3/0/8/130874434/567b63.pdfIn PDF document text
    • http://ejqy.com/gezalowizovubaninusoji2lks7.pdfIn PDF document text
    • http://busforpay.online/color_label_printers_commercialomj6p.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/3032596.pdfIn PDF document text
    • https://zowozenuzaf.weebly.com/uploads/1/3/1/8/131857278/dupasagibuzot.pdfIn PDF document text
    • http://frukt.fun/fisher_paykel_smartload_dryer_parts_diagramhkbo6.pdfIn PDF document text
    • https://cdn.sqhk.co/pofadugilip/hUSIbmm/arijit_singh_latest_songs_2020_list.pdfIn PDF document text
    • https://livakazogoje.weebly.com/uploads/1/3/4/6/134622539/ronun.pdfIn PDF document text
    • https://fusasevamasaxig.weebly.com/uploads/1/3/4/8/134866100/wowaxat-volamopotopej.pdfIn PDF document text
    • http://lg-copyrightforms.com/what_color_togas_did_romans_wear3vnbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449766/normal_602c66b2cca6e.pdfIn PDF document text
    • https://dizegovonaziluz.weebly.com/uploads/1/3/4/8/134881707/zuwuwawegi.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/paropabaru/mefosimiwufegedateno.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_off0000b7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B4 5080 bytes
SHA-256: 022b8b3079ca81b228969d4fc7cac88064d9076212ae5cf642ae25002c2f5c4c
font_01_sfnt_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 9084 bytes
SHA-256: 7cc4cb9bd3e9255d50597049c8ef8d37646c9ac971269bf0a04ec8e017c71973

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