Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0f9b0bea87a5b0…

MALICIOUS

PDF

75.0 KB Created: 2021-06-01 20:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f462a61712685ef77941dda0b149826 SHA-1: 8087b16e82680c50e335f290b4ecf7580e084081 SHA-256: dd0f9b0bea87a5b05f91c25315ed97cc273eda0d7e1c5823c3825228d859b766
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for creating link farms or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://queure.ru/pbw?utm_term=codecademy+answers+java
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/vapubome.pdf
    • https://lurotafimeka.weebly.com/uploads/1/3/0/7/130740015/be6b5719.pdf
    • https://pokeboxut.weebly.com/uploads/1/3/1/4/131437348/mosavof-fububivozared.pdf
    • https://cdn-cms.f-static.net/uploads/4368471/normal_601624640ff31.pdf
    • https://tifuvanolini.weebly.com/uploads/1/3/4/7/134703883/parafufes-sunopigijojege.pdf
    • https://cdn-cms.f-static.net/uploads/4389821/normal_60168e2e2756e.pdf
    • https://nigukaxo.weebly.com/uploads/1/3/1/4/131453065/b25f2750de.pdf
    • https://tafanoxuxirugo.weebly.com/uploads/1/3/5/3/135327873/pafapagubesagog-nofovitepex.pdf
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/8573617.pdf
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/bezewuwegagid.pdf
    • https://static.s123-cdn-static.com/uploads/4477615/normal_5fd06f43e7a3c.pdf
    • https://tokitowopune.weebly.com/uploads/1/3/4/4/134498993/8677174.pdf
    • https://bapidovomefizeb.weebly.com/uploads/1/3/4/3/134382768/1331516.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d0d95e13-e7c7-4cb9-bc02-9ad7c9761d1a/dapokobobepepumunarul.pdf
    • http://lakebimutep.pbworks.com/f/24500522515.pdf
    • http://garifukedako.pbworks.com/w/file/fetch/144426039/madotowavase.pdf
    • http://nagomax.pbworks.com/w/file/fetch/144423423/dapinivobububovu.pdf
    • https://uploads.strikinglycdn.com/files/e60b0746-54d0-4523-9f75-8ceac354fcea/58068925187.pdf
    • https://uploads.strikinglycdn.com/files/0bac400d-cba9-41ee-95bf-9151558f4468/el_amor_en_tiempos_de_colera_sinopsis_pelicula.pdf
    • https://uploads.strikinglycdn.com/files/c1d343de-1f47-46d8-8b8e-c3131100821e/warhammer_fantasy_battle_rules_2nd_edition.pdf
    • https://uploads.strikinglycdn.com/files/6760c1b0-448a-4305-a550-91cdef8afdc2/96310408365.pdf
    • https://uploads.strikinglycdn.com/files/09221143-6b3a-4cd3-b172-f6edcbb7aa95/how_do_i_reset_my_suddenlink_remote.pdf
    • https://uploads.strikinglycdn.com/files/08eb6638-8c16-46c4-b050-e81e2cc796f5/hampton_bay_ceiling_fan_replacement_light_switch.pdf
    • https://uploads.strikinglycdn.com/files/b2c74fba-d45a-4c31-aa83-e212514fd6a2/2008_dodge_grand_caravan_transmission_problems.pdf
    • https://uploads.strikinglycdn.com/files/64a94b27-e415-4582-ba98-9b897d91915a/true_pizza_prep_table_parts.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_off0000e879.bin
f9b2da1a7f18d6754f721b53b95a633458a35e83171fd6a03d2740a720e0d516		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 5288 bytes
font_01_sfnt_off0000fa79.bin
9b00c47ecdf0abbe72f50109bdcf39d8957b34d39776e77daddc3207281ae851		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 10684 bytes

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