Malicious PDF — malware analysis report

Static analysis result for SHA-256 983c4151ade96ca9…

MALICIOUS

PDF

73.6 KB Created: 2021-03-04 17:09:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c0866a84fe73e7c023e8aac034170de SHA-1: 2e78dba88279a06c7c9cc56a57cc80bb79b0b913 SHA-256: 983c4151ade96ca94d51c9794fed491704d0b5136124eea8c0be24489f0378bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious with high confidence. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what+are+the+al+anon+steps
    • http://kitukotobov.medianewsonline.com/how_to_light_a_comfort_glow_heater.pdf
    • http://wipunemobak.mygamesonline.org/how_common_is_obesity_in_australia.pdf
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/milejalireber.pdf
    • https://bibasalerudo.weebly.com/uploads/1/3/1/8/131857029/lijukun.pdf
    • https://wuzovogupo.weebly.com/uploads/1/3/4/7/134720757/furapew.pdf
    • https://nelurorinubix.weebly.com/uploads/1/3/1/3/131384252/zukawodogezum.pdf
    • https://vimitorumu.weebly.com/uploads/1/3/0/8/130814921/xukuwejufa.pdf
    • https://cdn-cms.f-static.net/uploads/4476268/normal_5fe9dd2a25ed3.pdf
    • https://wavozupuweno.weebly.com/uploads/1/3/4/3/134318760/febenogibid_timijipaxise_remisa_zavisuwemiloxol.pdf
    • https://cdn-cms.f-static.net/uploads/4369657/normal_602d7684f3869.pdf
    • https://dofafurubes.weebly.com/uploads/1/3/4/7/134762343/bc005d0bec43.pdf
    • http://wivevadevenumet.mywebcommunity.org/20404823653.pdf
    • https://dodapufil.weebly.com/uploads/1/3/0/8/130813701/lesinivoj-sesowulani.pdf
    • http://mowefopovog.mywebcommunity.org/itil_v3_service_strategy_book.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_d3a77ec029b64cc8a3438954f10b7c1f.pdf?index=true
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_38403896491540f4a58b808fd1b6bf9d.pdf?index=true
    • https://s3.amazonaws.com/zabejuvijolu/postcard_address_format_germany.pdf
    • https://s3.amazonaws.com/lodazojamuva/area_and_perimeter_of_rectangular_prism_worksheet.pdf
    • http://madepadejatutof.onlinewebshop.net/xosilimola.pdf
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_3da4ab3dc5b643fc9002a5a137af3bb0.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4fb.bin
b05d26270e827e5e887fe8eec5d66e64af876d123b9436add752cb2f5e41fa7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 4920 bytes
font_01_sfnt_off0000f5bc.bin
76c645cb70965cd781352d21e41fa85ccbb4ddf10c561bbbd56d27c099c40d70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 10444 bytes

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