Malicious PDF — malware analysis report

Static analysis result for SHA-256 7883ab4822da32a8…

MALICIOUS

PDF

76.6 KB Created: 2021-03-07 07:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 81626918a564ac8710d3a2a15976da15 SHA-1: a657e32448adc942410b2ae33819cff3bdea3f28 SHA-256: 7883ab4822da32a882c23df0b909ae6c3dea9419aca39d978a32a9c25c9cc634
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=ssr+125+motor+mount+bolt PDF link annotation
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/nonezedul.pdfIn PDF document text
    • http://alcexpress1.xyz/bridge_to_ielts_ielts_band_3_4zh3d0.pdfIn PDF document text
    • https://tixosagekade.weebly.com/uploads/1/3/4/4/134489061/lodili.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/50882585457.pdfIn PDF document text
    • http://pawomodom.medianewsonline.com/blank_employee_timesheet_template.pdfIn PDF document text
    • http://presente-top.store/maparodubotkryc2.pdfIn PDF document text
    • http://arm-watch1.club/87391429894qfan9.pdfIn PDF document text
    • https://girisuwudogepo.weebly.com/uploads/1/3/0/7/130776006/f06eba0.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/10544734744.pdfIn PDF document text
    • http://znakomstva69.space/wamofeoavrl.pdfIn PDF document text
    • http://bitoxifa.sportsontheweb.net/2000_buick_century_repair_manual_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_2d623cf79bf6470f86f78cd03d66daa5.pdf?index=trueIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_0351724c37264c28aaa8fd2b49b52724.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fa3bb56-881b-4e87-862d-6dc4a7d06a1f/what_do_rainforest_smell_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d54a0a0-d284-4f48-9f37-87d935f6c50b/nikon_af-s_dx_vr_zoom-nikkor_55-200mm_amazon.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/what_is_the_mmpi-2-rf_and_what_does_it_measure.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/aao_na_instrumental_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/geramufudog.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_off0000e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE773 5172 bytes
SHA-256: 075f04a63633bf03cc72c00240b7229af036e1554f9ec27c8c1e96e5da529fe8
font_01_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 1688 bytes
SHA-256: 7589cb9f0e709ca6bdd8af1c38d1552a363c3d0cc30cec28ccea6d03d7941ff1
font_02_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 10304 bytes
SHA-256: 509446d55829c2a517297d8743fa1da43f0c13c9bf04c3385a15c738f29c451d

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