Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5566f6d4393e50…

MALICIOUS

PDF

78.8 KB Created: 2021-03-31 05:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93fcd8117d28114258d9ba254604ee99 SHA-1: b108540f3ac7985011c3dda980f09a09e787e330 SHA-256: ca5566f6d4393e505a6089e234cb1626c7dbd256f9b5261876ba3bddf7b4faa8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF SEO Link Farm' heuristic. One of the primary external links, https://pelibifir.ru/wix?keyword=paper+mario+color+splash+strategy+guide, appears to be a lure for search engine traffic. The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The document body is heavily obfuscated and appears to be generated content, further supporting a malicious intent to redirect users to potentially harmful sites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=paper+mario+color+splash+strategy+guide
    • http://idealica-itufficiale.website/barbie_dreamhouse_adventures_dolls_amazonl4y1c.pdf
    • https://cdn.sqhk.co/pasededi/iejjgjF/dazalagusozejinopurozudi.pdf
    • http://bamefidev.mygamesonline.org/amitabha_ghosh_manufacturing_science.pdf
    • http://sevoxotedeki.medianewsonline.com/vadorogokodizasexogizo.pdf
    • http://bonifacy.site/kolaxoxofogarefenabi307n2.pdf
    • http://astropsychology.site/nilsson_riedel_electric_circuits_9th_edition_solution_manual1xdc5.pdf
    • http://mnclassis.org/nomenclatura_inorganica_ejercicios_resueltosd9ph4.pdf
    • https://cdn.sqhk.co/wixadigizal/je6ibPo/66078349216.pdf
    • https://cdn.sqhk.co/vavefamixivi/3jcvcKj/ancient_greece_clothing_information.pdf
    • http://dkblogin-de.best/pukebujelavabowamobomvkws1.pdf
    • http://nakozek.mypressonline.com/what_kind_of_hydraulic_fluid_does_a_kubota_take.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/0c554f5b-f944-4ad3-9e99-ef9b7c04ee28/telibinavub.pdf
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_f87ea80324d8433aa69c376e6a5792cc.pdf?index=true
    • https://189c2d36-84ff-4b81-9465-96c33c1d3b91.filesusr.com/ugd/35ddae_bb6e27b633a64e21a3421bf42915a307.pdf?index=true
    • https://uploads.strikinglycdn.com/files/76e1c2f3-44c0-4c2f-ac23-67f50eda69a5/data_analysis_software_open_source.pdf
    • https://uploads.strikinglycdn.com/files/b0917eaa-3148-4d69-a23d-0a6f8c5115ca/beretta_a300_outlander_turkey_choke.pdf
    • https://4fcc26ae-a476-48f2-98aa-cdc5c12f4544.filesusr.com/ugd/32d0e1_8be0cd2c2f904a0ba9567c4b7b63e95e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/021f1cf7-2e30-4122-a47d-37adfc569562/novena_prayer_for_the_dead_ilonggo.pdf
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_5a6756bbc38d4b78ac2e1bd99fe21f2e.pdf?index=true
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_7e073a3865344277afb19c2ee2e9b346.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bdf05556-d2eb-4814-9f71-2646de2f3627/bosch_axxis_washing_machine_detergent_dispenser.pdf
    • https://uploads.strikinglycdn.com/files/cdf95c92-ee73-4603-a5a8-42411f45caf8/12546749148.pdf
    • https://uploads.strikinglycdn.com/files/8b5233ac-1dc0-443b-a43f-106947589f9d/53876135029.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_off0000e824.bin
2c5adf3caaa4ae7b1d47927c398ea93447a4569887d32ea5a8de925f8f84ac3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 5364 bytes
font_01_sfnt_off0000fa62.bin
ca4f0fd1bf549e0bf9de5e57f5ff4274195aacb7d03a8b828966fc1098e5d475		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 10244 bytes
font_02_sfnt_off00011d4e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 4324 bytes

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