Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c94a1b60ccb29d…

MALICIOUS

PDF

76.2 KB Created: 2021-04-02 14:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c59dd3d686a81bb075ff9b3b560a0e65 SHA-1: b9cd95d2936b2001f0b8d249653bb11084551136 SHA-256: 83c94a1b60ccb29d277a31e205a66a85606730bfded2e1389cb6b6a947038edb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://seumenha.ru/strik?utm_term=modo+de+produccion+de+la+comunidad+primitiva+pdf
    • http://tigawadilen.iblogger.org/ap_world_history_outline.pdf
    • https://fumumakol.weebly.com/uploads/1/3/4/0/134017799/tababi.pdf
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/tenikaparutatabot.pdf
    • http://jimefat.22web.org/19952586750.pdf
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/gebutavotutuloj.pdf
    • http://gibafafe.22web.org/atomic_structure_and_periodicity_notes.pdf
    • https://dibuponabax.weebly.com/uploads/1/3/4/3/134340508/5978661.pdf
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/2197609.pdf
    • https://bozuwosumexoxal.weebly.com/uploads/1/3/2/6/132682772/muzegojarogun_digajenimemidi_zababopupeli.pdf
    • http://nefuwumimo.iblogger.org/approximation_question_for_bank_po.pdf
    • https://jetetinabalu.weebly.com/uploads/1/3/2/6/132682142/7265726.pdf
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/1151fd608e5b6fd.pdf
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/7060900.pdf
    • http://xolokukifimiv.sportsontheweb.net/wireless_headphones_compatible_with_lg_smart_tv.pdf
    • http://vobalemujumojak.mywebcommunity.org/how_to_connect_rock_band_4_guitar_to_xbox_one.pdf
    • https://zagamujibagixon.weebly.com/uploads/1/3/5/3/135326067/a0cd45460d60.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d33f6b9f-fd19-40b0-b0c6-d4ca31e986d0/jovetokaresix.pdf
    • https://uploads.strikinglycdn.com/files/5cad2751-c99d-41a8-bacb-8f6ad5cf7b05/35373033372.pdf
    • http://silavijegam.epizy.com/92825559685.pdf
    • https://uploads.strikinglycdn.com/files/55fd3a33-1af9-40ac-ac5c-a9e3eec99062/4194763220.pdf
    • https://uploads.strikinglycdn.com/files/43a1dd7a-8874-4679-8ace-3b5641368e8d/givopakumugavuxorakadob.pdf
    • https://uploads.strikinglycdn.com/files/bdaa6ae8-5dd8-4c4b-8a1c-bc09686889b1/what_is_gr_date_in_sap.pdf
    • http://xobibaga.myartsonline.com/dusumajataki.pdf
    • http://ravinod.rf.gd/mappa_turistica_agrigento.pdf
    • http://mavoweba.epizy.com/what_foods_are_gluten_dairy_and_egg_free.pdf
    • http://busizamufake.epizy.com/93021778055.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_off0000e866.bin
90356c95ddc191f935679f729ff4829826a6983ba92a40196703b4a0e82ee03c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 5188 bytes
font_01_sfnt_off0000fa11.bin
ed57d12adc827b38579dab560ec12ebfd016a4af0562794af61f04708fe06408		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 11884 bytes

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