Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea5c1b974e43f48…

MALICIOUS

PDF

80.6 KB Created: 2021-03-20 20:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a391f7d94c7edd5b038409cdc230958c SHA-1: b983f1f71eb56bc903e12d0546183c4b6261d8d3 SHA-256: fea5c1b974e43f48163b4141656a2ef79162b5e4e792ca9cc59e55e22e35aad4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files hosted on file-sharing services, indicative of a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely using the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/award?keyword=ds+82+application+form+for+passport+renewal+pdf
    • https://nobawevedidilut.weebly.com/uploads/1/3/1/3/131379382/nuzekabuzop_dilabatukabawa_goworoko_tefas.pdf
    • https://datulexajolibup.weebly.com/uploads/1/3/0/7/130738708/mezotegulebojakip.pdf
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/2470404.pdf
    • https://mudabomem.weebly.com/uploads/1/3/0/9/130969182/zodusijinujevow.pdf
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/3157329.pdf
    • https://cdn-cms.f-static.net/uploads/4382197/normal_602612f20ac82.pdf
    • https://cdn-cms.f-static.net/uploads/4383688/normal_601529cce01d3.pdf
    • https://jigokuzubunuk.weebly.com/uploads/1/3/4/7/134750148/2ce599d0dd28855.pdf
    • http://suxoxaxowigab.scienceontheweb.net/fa700e_freeze_alarm_telephone_dialer.pdf
    • http://zeboxagekej.sportsontheweb.net/abrsm_grade_8_theory.pdf
    • https://lopepuru.weebly.com/uploads/1/3/4/3/134320072/jixajenizuwegix.pdf
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/fuwadup.pdf
    • https://muwujexowosis.weebly.com/uploads/1/3/1/4/131437891/mijobilevilo-leboweb.pdf
    • http://dapurixid.sportsontheweb.net/30597540334.pdf
    • https://bapepewemeg.weebly.com/uploads/1/3/4/7/134702997/9fdc5b3e3361.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://leparitupoxow.onlinewebshop.net/adenoma_pleomorfico.pdf
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_14570c770d6d48f69098382ead993b54.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6cbfec16-8d20-41c4-91c3-9f194824bd2a/diary_of_a_wimpy_kid_collection_12_books_set.pdf
    • https://uploads.strikinglycdn.com/files/5f1630e1-804b-435b-b759-477821074c97/how_much_does_a_manual_swap_cost.pdf
    • https://uploads.strikinglycdn.com/files/a49cf797-2586-4a68-90cc-7df221b88512/what_are_normal_ekg_test_results.pdf
    • http://bavevex.onlinewebshop.net/50672135223.pdf
    • https://uploads.strikinglycdn.com/files/845ba296-e6e0-43ea-b0ea-eabd1e16edcb/xazibojaj.pdf
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_263cc4e4a3eb4455a2001d7073cac713.pdf?index=true
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_0110907b180747c8bab6ae917e80bf9b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f008321c-fa64-4b96-b227-bec6540ba500/35767129782.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_off0000fc30.bin
3f1776b96d6989c3e905f50430815f4d555605d72f21e305209de44fdb9a66a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 5720 bytes
font_01_sfnt_off00010fae.bin
7d5ec6b5314d5475769e8f580da6bdee39155262610f8eeeed4e7cc20fa22b49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 10912 bytes

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