Malicious PDF — malware analysis report

Static analysis result for SHA-256 875175b0504ca338…

MALICIOUS

PDF

74.5 KB Created: 2021-03-15 14:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e3f5fabc62b035e6b9e77d81419c48ff SHA-1: 67ab188912e6ea143c5e6ab3595fdfc0a951f7b9 SHA-256: 875175b0504ca338763e8b1813467d4c7f272f77fe29d1072ad206c1ad0d3c42
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the document's structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=your+sim+sent+a+text+message+iphone+xs PDF link annotation
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/f3aacc4a06.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/737eb69116f.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/5f7e7.pdfIn PDF document text
    • https://jewelalebun.weebly.com/uploads/1/3/4/5/134585336/duxebomarigafin_dekitevolesaji_kodel.pdfIn PDF document text
    • https://rewumakabaw.weebly.com/uploads/1/3/4/8/134856880/495b8748a3.pdfIn PDF document text
    • https://mizilugodipibo.weebly.com/uploads/1/3/0/8/130813887/puponidasivosuvem.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/9c64e5b3ed4.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/Wejdkia/nasa_asteroid_warning_2019_october.pdfIn PDF document text
    • https://roguraluvi.weebly.com/uploads/1/3/0/7/130776180/vokuvajizazobonapu.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/cGheJhi/19063395618.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_493b6e6c4e4a48afbb33bd71f97771ae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d27cd1b5-bcbf-40b7-a9e8-3559b5346d4f/i_believe_statement_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b358d154-4c77-4090-9a19-a05a2b91c762/david_hume_an_enquiry_concerning_human_understanding_section_2.pdfIn PDF document text
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_6e161db69649415ba774147b669f108e.pdf?index=trueIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_7dfdc5c49f5649a4909368c129bf3359.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3099d273-0e83-44e7-bbbf-fbd0e09d5f89/76276958650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07df8f48-6911-4951-b56e-c470d481ff53/can_u_sleep_wearing_contact_lenses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f3c1b6e-c7d7-4ca0-802b-93a050a8a13d/baby_girl_easter_outfits_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cb07d83-c50e-412a-96ea-e3bb611b3870/53430340450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8af444a-1f79-4d44-b2d0-d9ee259ba386/kenmore_gas_oven_igniter_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac83c80-b0bd-4ce7-b758-f085bae9a7fb/how_many_calories_are_in_a_taco_bell_hard_shell_fresco_taco.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE538 5232 bytes
SHA-256: 37b360feb385c397c0a654925f9c2dec499fae4e92ca67034eafade34ab6ed58
font_01_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 10640 bytes
SHA-256: 7666ce95bc08feb68b634dad540d11b19b313dc029b409a629d86afab0b002c7