Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef883cc2d007ac7…

MALICIOUS

PDF

83.9 KB Created: 2021-04-13 00:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b72412a9f7c132b4faec5703554b05c4 SHA-1: ed548a27fae7a8bf6eb0e31e5c072f4e61037973 SHA-256: 8ef883cc2d007ac79729a7754c8a75b779e71a906ee7f5f8ab840206b57b6642
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, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/strik?utm_term=how+to+convert+wii+to+hdmi PDF link annotation
    • http://stavki-na-sport.site/the_secret_sharer_joseph_conrad4ttm4.pdfIn PDF document text
    • http://wssummer.space/nibesimapbq126.pdfIn PDF document text
    • http://fresh-ita.space/duzewakalekeruxibibpabd.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/jaxetasususav.pdfIn PDF document text
    • http://aycotoro0.xyz/can_you_cook_pizza_in_a_toaster_ovenc00ec.pdfIn PDF document text
    • https://zavadogo.weebly.com/uploads/1/3/4/3/134325895/f27f2bce.pdfIn PDF document text
    • http://indir-kazan.com/how_much_does_a_lawn_mower_tune_up_costb4du1.pdfIn PDF document text
    • http://sqrab.top/1503633645wlo9.pdfIn PDF document text
    • http://help-feedback-amzn6.xyz/how_to_connect_your_wireless_turtle_beach_headset_to_xbox_oneo2xaj.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/zogejemadeva-notafivunamob-betazodevawi-wiperenaduxozap.pdfIn PDF document text
    • http://casserlabs.xyz/the_school_of_greatness_podcast_spotify2671q.pdfIn PDF document text
    • http://glawerry.online/60527900872n0hhx.pdfIn PDF document text
    • http://watertea.space/fundamentals_of_piano_theory_level_160yaq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_5cf2d5b93bb54c4fa018229d46af4aab.pdf?index=trueIn PDF document text
    • https://5e04165b-6ab1-49a6-9937-45006fc2fbeb.filesusr.com/ugd/d19879_bc7f780ea12b4164ba82f6a22f881e90.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_dae05c0fc47d465181452a8bf4d68287.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/distributive_property_of_multiplication_5th_grade_worksheets.pdfIn PDF document text
    • https://9aef9be9-4304-4ec6-b02b-ded1eabc5d1b.filesusr.com/ugd/a571b8_26ad355de35b4f528a3a15ebe3b7fed1.pdf?index=trueIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_61f56e0e48b24812956fedc137c735fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lerezazo/bemifizenibirakas.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_2b664dc9ab214ecb8d18cc8bbc45fabb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/59316125209.pdfIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_c8817972a7d24159a5b83ccc007c1baf.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 4660 bytes
SHA-256: 88ec47c61abbdf045a905c17e6b8c5ca4dd1e81463d95143a387d6e3621b71ed
font_01_sfnt_off00010dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC9 10772 bytes
SHA-256: fd9f78393ed403c71893dcf1e1405d339f6ca706662f17cca22d85c838fe4786
font_02_sfnt_off0001327d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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