Malicious PDF — malware analysis report

Static analysis result for SHA-256 234b182f9b5aee6b…

MALICIOUS

PDF

135.0 KB Created: 2021-03-09 13:18:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c16f26a09564ae4f86f0b63b8a7b4cf6 SHA-1: e3700caabf629902a39cf2b446d517b252ae227a SHA-256: 234b182f9b5aee6bf15bcf0061bb24388eba9f51d33a620aee91d33d333b3189
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to benign-looking PDF files, but one URL points to a suspicious domain. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates a phishing attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://botokaw.ru/strik?utm_term=best+race+warhammer+total+war
    • http://fegokodelaxen.scienceontheweb.net/are_they_making_a_unwanteds_movie.pdf
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/zimakiga.pdf
    • http://punavuvipufov.sportsontheweb.net/bowosilexubejinajosir.pdf
    • https://tovuwofox.weebly.com/uploads/1/3/4/7/134731163/2033913.pdf
    • https://giwemonuxir.weebly.com/uploads/1/3/0/7/130775654/wujiga.pdf
    • https://rulipowijipej.weebly.com/uploads/1/3/0/7/130775545/75cf03.pdf
    • https://sotipazokelaxat.weebly.com/uploads/1/3/2/7/132712266/larixifakekare.pdf
    • https://wiludexubusut.weebly.com/uploads/1/3/2/7/132740186/e573b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zijiwaras.onlinewebshop.net/acer_aspire_e5-571_price_in_pakistan.pdf
    • https://uploads.strikinglycdn.com/files/a18fd4c6-bbcb-4275-a074-642695a9d550/83817172055.pdf
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_23b63afd41fb4bc48f2bdf4ba103c480.pdf?index=true
    • https://s3.amazonaws.com/vaxebisapesi/common_ion_effect_on_solubility_answers.pdf
    • https://s3.amazonaws.com/vufupu/33086136749.pdf
    • https://uploads.strikinglycdn.com/files/3f62ca2c-7276-4cdc-a2fa-6e0022566a87/how_to_reset_a_dish_hopper.pdf
    • https://uploads.strikinglycdn.com/files/e3403a55-86a1-4bd1-b408-a889ac4df289/hoover_vacuum_windtunnel_3_belt_replacement.pdf
    • https://12f7643e-9106-4823-89c2-0bdaecd1bc22.filesusr.com/ugd/1f6d71_0a1e6d6660c44538b1509fefa283d4c8.pdf?index=true
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_b6408e86325e4faa83e1e809430a49e9.pdf?index=true
    • https://s3.amazonaws.com/bamepofewalada/fuvafifenabonawu.pdf
    • https://uploads.strikinglycdn.com/files/32bae50c-4c4a-436d-94a0-53af7c58c95c/56221779325.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d641.bin
991f304a21e7afd51ebb6e4079ab0a67c28f81edecfa849c689b8a3f747eccca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D641 5180 bytes
font_01_sfnt_off0001e7c6.bin
d38a50743113421b3ccc3b7efcae33579ffae233c23d55d2cf7cc4a492e9ad6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7C6 11268 bytes

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