Malicious PDF — malware analysis report

Static analysis result for SHA-256 5916cdca73fc2d6f…

MALICIOUS

PDF

76.8 KB Created: 2021-03-30 01:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 030bc07116bb26f1e5bc3ace37f9ea4d SHA-1: 272db5ca62f02e37ae1195fd0824c1fd29e92b14 SHA-256: 5916cdca73fc2d6f942b1ecbd1db91e9fee1a780564d442d762f9aacbfca5d6e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary external URI pointing to 'https://dugedepap.ru/award?keyword=materiales+petreos+y+ceramicos+pdf', suggesting a lure to a malicious site. The document body is heavily obfuscated, but the presence of PDF-specific heuristics and numerous links points to a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://dugedepap.ru/award?keyword=materiales+petreos+y+ceramicos+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383572/normal_602e30318bdf9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387808/normal_60089e2d1f3f1.pdfIn PDF document text
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/446cac35389b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_602c7ba5a7f33.pdfIn PDF document text
    • http://dominis.xyz/how_to_change_a_kinetico_filter6n7pe.pdfIn PDF document text
    • http://trysol.xyz/kicker_pt250_10_subwoofer_with_built-in_100w_amplifier_reviewt2l6m.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/ed23gcp/43330946882.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_602cb1a6afc53.pdfIn PDF document text
    • https://viropozokuputaj.weebly.com/uploads/1/3/4/4/134441516/2357184.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478716/normal_60047644b89cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_6038ea37abfc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501041/normal_6005803b5bd39.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/O7jfwHe/dragon_ball_dokkan_battle_music.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/pirilunevapa.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxowilag/8ZjfBic/3207986235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_603f46131297d.pdfIn PDF document text
    • https://cdn.sqhk.co/bipobulif/2Whjs6P/indoor_waterpark_iowa_city.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/26b0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fe013b100d3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kugunimekuxaf.epizy.com/aeg_built_in_coffee_machine_manual.pdfIn PDF document text
    • http://pamiwumewamem.epizy.com/papa_s_cheeseria_to_go_apk.pdfIn PDF document text
    • http://diwozonez.epizy.com/janapada_geete_songs.pdfIn PDF document text
    • http://xekubot.epizy.com/lukupiwupodakadoxakojoda.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_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 5408 bytes
SHA-256: 5f6e306581c29ea94cfc0a6a971676438432f36b33a28193934205f3278bdd60
font_01_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 11788 bytes
SHA-256: 3722dc3561025aa1d3bcc1688764e1f52210afad84c0dbf57bb3d5a3c5e0e5fa