Malicious PDF — malware analysis report

Static analysis result for SHA-256 319297ed74a4ea38…

MALICIOUS

PDF

79.5 KB Created: 2021-04-20 13:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 41d95ff7b004abf02f4f33a6d1f47a0c SHA-1: a9ae3a2001b6b449a710877bae73e64790924afd SHA-256: 319297ed74a4ea38b355261c731e8ace0f533d1ff42878cc9b770ef06d53dbe8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external PDF links further supports this, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=no+more+mr+nice+guy+robert+glover+reddit PDF link annotation
    • http://reduslim-ufficiale.website/kapebazikovupgjq8a.pdfIn PDF document text
    • http://gatorama.space/virus_rubellab6o7y.pdfIn PDF document text
    • https://tipiwaterexiw.weebly.com/uploads/1/3/3/9/133997214/e1dd275f297dacb.pdfIn PDF document text
    • http://world-wild-shop.com/audio_driver_windows_7_64_bit_lenovobabf0.pdfIn PDF document text
    • http://sethel.xyz/431721511035yxkd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_5fd7ec9c7c80c.pdfIn PDF document text
    • http://knitfqph.site/how_to_turn_on_cuisinart_air_fryerhzkor.pdfIn PDF document text
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/19f6c18b7f12.pdfIn PDF document text
    • https://rinadulig.weebly.com/uploads/1/3/0/7/130739308/3970030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_60496750c3685.pdfIn PDF document text
    • http://donbetosstreettacos.com/washington_wizards_jerseys_2021wv6s5.pdfIn PDF document text
    • http://reduslimitaly-official.website/banulaxitibesomq84xe.pdfIn PDF document text
    • https://zimazegikej.weebly.com/uploads/1/3/4/7/134732290/fedixof_xudutebovesag_bolomegofo_vopuj.pdfIn PDF document text
    • http://opendouche.xyz/41482834944ah0wp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_6038bd74618b3.pdfIn PDF document text
    • http://snegny.com/42443366217qg0aq.pdfIn PDF document text
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/zuniwaxiniwaru_fituruwota_koguvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_980d522231c94082bdd3e139584daabb.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_33e13e7d51954dd7a2838b9ae262efd4.pdf?index=trueIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_2ce01fcc7bf74d41ba8fd8c4a6dcb8d5.pdf?index=trueIn PDF document text
    • https://77cbb24c-feae-490b-854c-0a9d4db21a85.filesusr.com/ugd/3752ea_17056900b4ef4e198377f2e7cd6c5208.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dozore/finawitirovif.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_334c8d1de6b9402485c29804c0d11f9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifuto/74573991445.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/pride_and_prejudice_online_stream.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/figures_of_speech_worksheet_for_grade_7.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 5024 bytes
SHA-256: 348530090f6241481aea448386f7622a5c31cb8b50f1b5d4a55140c3e5b84ab9
font_01_sfnt_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 10196 bytes
SHA-256: 17dc92e6b491e1201dac9d81e030a1efb4417659dea5a8316b82004c26856038
font_02_sfnt_off000121f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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