Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a778e64b2c440b…

MALICIOUS

PDF

80.7 KB Created: 2021-03-11 03:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0941a8ada53454b890adf8f2f0b78805 SHA-1: 9ff383750694e45b5a25d2a9fa7ced7bc36a7836 SHA-256: a9a778e64b2c440b65b92871078064378ed20ba83d3f16390bc4bbec007e662d
186 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 disposable hosting services, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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://dafemum.ru/123?utm_term=tamilrockers+2019+aruvam+tamil+movie
    • https://cdn-cms.f-static.net/uploads/4417805/normal_601d2b026fe62.pdf
    • https://cdn.sqhk.co/fugapaloter/dgidicv/shake_shack_menu_dallas.pdf
    • https://zabaruwizugode.weebly.com/uploads/1/3/4/5/134596412/gubulonefu.pdf
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/jadawolofuxowasisu.pdf
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/nipolibokonukowuvu.pdf
    • http://fortysgjdk.fun/codycross_answers_group_121_puzzle_47909u.pdf
    • https://cdn-cms.f-static.net/uploads/4387813/normal_60292b9087bc5.pdf
    • http://malespw.xyz/137177673961suem.pdf
    • https://cdn.sqhk.co/lerapuraroke/NgeghX0/national_geographic_membership_cost.pdf
    • http://dorightschool.com/46897615386kz4gm.pdf
    • https://cdn-cms.f-static.net/uploads/4410415/normal_602e9f2b44ffa.pdf
    • https://pofimutazotoxo.weebly.com/uploads/1/3/4/0/134000188/7401459.pdf
    • https://cdn.sqhk.co/gapalagabig/WNgehat/4320654478.pdf
    • https://static.s123-cdn-static.com/uploads/4476416/normal_60025abb7a907.pdf
    • https://cdn.sqhk.co/tibidimewako/i2JjaDD/adventure_capitalist_hack_steam.pdf
    • http://madewithsunshine.com/kim_kardashian_game_download5enr6.pdf
    • https://sefokuto.weebly.com/uploads/1/3/0/7/130738721/pudokazave_taliwagobade_wetixaj_nazafomipon.pdf
    • http://lovechat24.club/angelcare_mini_bath_support_reviewdohbh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_aabba77dce7c4749b17ba68a05e407fe.pdf?index=true
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_f1bd060281894df5bcb67ebbf09f22cd.pdf?index=true
    • https://s3.amazonaws.com/bopuxosavubare/xitawujojexezopet.pdf
    • https://s3.amazonaws.com/gelawiweza/jatugosugavozekuje.pdf
    • https://s3.amazonaws.com/rebesudanolo/wogibijulitosavapikujemu.pdf
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_93225444961d41e38bb46fc6cbfe5590.pdf?index=true
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_9f11f752e98d423a8e7e70b29bb81669.pdf?index=true
    • https://s3.amazonaws.com/bejikefowu/architecture_floor_plan_app_apk.pdf
    • https://s3.amazonaws.com/vibuvomomuv/mitaxipozebafewudeji.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f34d.bin
37ac9c5ad932bcde6c1d1eeb37a7580ffa874b998c5bb9967dfe64cb83ea3a0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 5500 bytes
font_01_sfnt_off000105e8.bin
73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 1936 bytes
font_02_sfnt_off00010f2b.bin
bb0d45cb362c5bf85ae6f048c95ec44ef1890c28bc67bc82af6b10d373e9257c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2B 10952 bytes