Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16a0a257b812e0a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-13 21:05:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 682083aa396c0ccd0dd52c37edd79b43 SHA-1: 7ef7e2ca1b86ed150e1d7a9a3a38c7769bdccb4a SHA-256: b16a0a257b812e0a9a31187ad44653e32a608d2da9e932d3c688592e06e8ccae
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to attract search engine traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/wix?keyword=pogil+ap+biology+membrane+function
    • https://cdn.sqhk.co/wosipuvetot/JrrghRY/tlcharger_aptoide_gratuit_sur_android.pdf
    • https://cdn.sqhk.co/goxupolofodi/DWgcaNY/minecraft_island_village_seed_xbox_one_2020.pdf
    • http://kevakigev.medianewsonline.com/augusto_cury_felicidade_roubada.pdf
    • https://cdn.sqhk.co/kuzosexiwugu/gihhgqn/65114503333.pdf
    • http://ruxuzosok.mywebcommunity.org/20085959380.pdf
    • https://cdn.sqhk.co/tofatuxurejo/ibgDggS/87850000938.pdf
    • http://jadogaxarabu.mygamesonline.org/colored_pencil_drawing_ideas_easy.pdf
    • http://nibajafij.medianewsonline.com/frozen_jr_script_part_2_-_gibson_county_youth_theatre.pdf
    • http://lilubaxubaxulu.sportsontheweb.net/31778491621.pdf
    • http://xufelaketodo.getenjoyment.net/dedet.pdf
    • https://cdn.sqhk.co/jeporikate/idkCohc/bee_backpack_purse.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/forupokisip/21641266909.pdf
    • https://s3.amazonaws.com/xamibudasagas/nabixesuworujepefi.pdf
    • http://kojuvurapamox.myartsonline.com/42644930888.pdf
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_91b39d6011ed448ca05355ec47ea9df9.pdf?index=true
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_492a9184a9b34350bf822a767f25e4fa.pdf?index=true
    • https://s3.amazonaws.com/gixawetopoli/17434196690.pdf
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_970b31e8aa1e48049df4eae1b45d2344.pdf?index=true
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_c7d5af4fbbbe43408e953436f1676d50.pdf?index=true
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_96986beda72f4cacb3c9ea5d3705e510.pdf?index=true
    • https://s3.amazonaws.com/tozaduliwubega/63590697583.pdf
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_424d88adebce4a489629086da64e322b.pdf?index=true
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_56f6ae8cdc2e4b0c94fdf85eb8c40d26.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_off0000e87e.bin
1926130cef0ce76b4c885772229e199157b98e5919ec567749f01b0b235b2f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 5400 bytes
font_01_sfnt_off0000fad7.bin
98763b1fbcc286491896c97e8e52dd4d9035b679f045662696cff3e93e4a61da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 12300 bytes

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