Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61e0de6667456b4…

MALICIOUS

PDF

74.1 KB Created: 2021-03-30 12:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0351de2352a95a416ffce60e1bd2aeb SHA-1: 2292c17736892e56e685f9c4fa775b9f792c47a7 SHA-256: d61e0de6667456b41a72f1d931045e9201bc97286ad652614ab6e9e3fb61b4a5
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or phish users. The document body and embedded links point to various URLs, likely intended to redirect users to malicious sites or download further payloads.

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
  • 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://maypoin.ru/wix?keyword=world+history+guided+reading+workbook+answers
    • http://latitekiwa.scienceontheweb.net/bulgarian_cuisine_recipes.pdf
    • https://cdn.sqhk.co/mamevugixej/01hhS2y/4_immagini_1_parola_6_lettere_soluzioni_italiano.pdf
    • http://mavafesumej.medianewsonline.com/97466152262.pdf
    • https://tuderosuf.weebly.com/uploads/1/3/4/6/134652240/puzovujiwuku.pdf
    • https://cdn.sqhk.co/dilobowuz/FWhb5Zp/sepumikomorilomifutobivo.pdf
    • https://cdn.sqhk.co/rifelefiw/hqgj6jd/color_rope_level_10.pdf
    • https://jekotufuwin.weebly.com/uploads/1/3/1/4/131406020/5288011.pdf
    • https://kupejuzog.weebly.com/uploads/1/3/1/6/131637034/tegaj.pdf
    • http://midesamipazizuj.scienceontheweb.net/menerurigoxana.pdf
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/ab8746364b8.pdf
    • http://lifelalulenomip.mygamesonline.org/80349144618.pdf
    • http://simopuvoramawu.mywebcommunity.org/how_can_i_get_my_drivers_permit_during_covid_19.pdf
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/9a40e390c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_450a5b85c53e4c08b61539a51fa2b2f8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dc450e58-b6e8-4b37-84d7-083a7b70aa14/return_ascii_value_c.pdf
    • https://uploads.strikinglycdn.com/files/c5507de3-a8c3-4f5f-bc68-1f26dab1adaa/rules_for_knights_templar.pdf
    • https://uploads.strikinglycdn.com/files/d6697b3b-9c6d-4009-abf2-dbe1a32bf90d/how_to_listen_to_music_while_running_iphone.pdf
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_fbfefd8497f1408e85571e03f05cf00d.pdf?index=true
    • https://0b7b936c-93ac-4a60-9644-6ba220b934cc.filesusr.com/ugd/b4bf80_53e5ef8cb96142198d079871e5a36c4c.pdf?index=true
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_35869a5f3ef340b8b25eea2774545144.pdf?index=true
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_f2ac2fb21ef04b6ca1ed3ef33396f0f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b24278e9-08ed-4afc-b5c0-b8b172f4d202/nail_salons_near_me_open_now_cheap.pdf
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_88b3508a9d074eac958a194fbb1049a3.pdf?index=true
    • https://a909b8fe-7c6e-4467-a5b6-92e64a2a5b5d.filesusr.com/ugd/65efca_1965ea8339f041398d7d33003edee217.pdf?index=true
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_324a8cedfe364befbbb608532cebb886.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d636.bin
4bfe7eebac65aeab497fef30ccce5008923baefe4c55688eb6348f7578488312
pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 5380 bytes
font_01_sfnt_off0000e896.bin
3f9493d45b8454aebab6e6c5bb9e17912009232b081f71d65a5615eb0181f1a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 10324 bytes
font_02_sfnt_off00010c1d.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 4324 bytes