Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6a4248ef407dc1…

MALICIOUS

PDF

80.1 KB Created: 2021-03-15 20:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3d91ad512772ceed1abc28f8d7d41c26 SHA-1: 55dfae94eca0e2e52a305f32d5ff72a4167c0d20 SHA-256: aa6a4248ef407dc1a89ad837b2837c04d416ad0440786760b62fa6a36c599e65
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, suggests a lure related to 'Turbochef oven cleaning instructions' to entice users to click the malicious link. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as phishing and a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=turbochef+oven+cleaning+instructions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4443619/normal_603f446eeeef2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477162/normal_60028ff677c5d.pdfIn PDF document text
    • http://indital.fun/tariwisepesavobax1dg5.pdfIn PDF document text
    • http://kajipim.mypressonline.com/how_do_you_say_mandarin_orange_in_portuguese.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/33121116168.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/mechanics_and_thermodynamics_of_propulsion_2nd_edition_solution_manual.pdfIn PDF document text
    • http://ledy66.net/21165815986ul8dx.pdfIn PDF document text
    • http://salea.site/tofujirewavixb21n.pdfIn PDF document text
    • http://jerabigemoz.sportsontheweb.net/64467532040.pdfIn PDF document text
    • http://jofipifemu.medianewsonline.com/built_to_last_james_collins.pdfIn PDF document text
    • http://groshyk.site/33008558230bzd2o.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/61980474307.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_06796662c869470a978cd423a6028bc4.pdf?index=trueIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_e7127eae8f574adb8029dc1477a7313a.pdf?index=trueIn PDF document text
    • http://rirazito.epizy.com/wixitirewojon.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_aa95c617490d4496bbe272abdd009fce.pdf?index=trueIn PDF document text
    • http://fufabufitilaf.epizy.com/is_krav_maga_dangerous.pdfIn PDF document text
    • http://fipivolakiwupod.rf.gd/gawozovanu.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_76c3d5fcfcad43b6a10236019088f18d.pdf?index=trueIn PDF document text
    • http://rofuvawitarul.atwebpages.com/why_is_my_john_deere_mower_not_starting.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_11db411822034872940612636aa7fa42.pdf?index=trueIn PDF document text
    • http://bopisumeku.atwebpages.com/45559631602.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/nuzidugulopofajevilu.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/nunixanujinapotoxume.pdfIn PDF document text
    • http://boxitevu.rf.gd/24749132554.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 1604 bytes
SHA-256: 73b7f44e39bfa6d983a770ca4be90271880bb5d1867b4b39700504a0098866e0
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 5292 bytes
SHA-256: 3a939fb40bfbb947c4656f574448db9138eb70c6842354fcf9ae64471b34843c
font_02_sfnt_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 11432 bytes
SHA-256: cc821f24fe49ba1174c69183cc818bc6169b638795c02db9b881e9497f3e6cbc