Malicious PDF — malware analysis report

Static analysis result for SHA-256 a207b12f50c1faff…

MALICIOUS

PDF

76.8 KB Created: 2021-04-24 01:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ed9bdd600326aa3ab7a4d300217b45f SHA-1: d6971fabbd987dee974b2a0b8bf35c1deebed732 SHA-256: a207b12f50c1faff315a900029de717caea7f37fce2ebaff9aac16f612441f7a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially malicious or phishing sites, possibly as part of a larger campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=what+is+feminism+sociology+definition
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/ceacbc9eecfe.pdf
    • http://gojifoxedot.iblogger.org/96700575467.pdf
    • http://tivuximuliku.mygamesonline.org/25951756458.pdf
    • http://zobavomafiv.iblogger.org/english_grammar_book_for_class_9_cbse.pdf
    • https://dufemejilesola.weebly.com/uploads/1/3/1/4/131453127/1186073.pdf
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/d230439382abfe5.pdf
    • http://sifaritube.sportsontheweb.net/pdf_to_word_converter_online.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c5f4bec4-0323-448d-ac7a-b14e217499e6/79448335098.pdf
    • https://s3.amazonaws.com/nitizobuv/winirigetixab.pdf
    • https://uploads.strikinglycdn.com/files/98056428-d399-4f73-8e36-b1cea44b526b/how_do_you_read_a_century_battery_date_code.pdf
    • https://uploads.strikinglycdn.com/files/c2c2dbce-3683-4b16-9885-ccc59c384683/can_samsung_a10e_be_charged_wirelessly.pdf
    • https://uploads.strikinglycdn.com/files/ea77c252-340f-4e75-8ed8-10ec73765e87/putuwofi.pdf
    • https://uploads.strikinglycdn.com/files/4b34a841-3320-4a5b-9b20-5d938b0588bb/dabixaxot.pdf
    • https://s3.amazonaws.com/desekusoxi/fifty_shades_of_grey_walmart.pdf
    • https://s3.amazonaws.com/vuxalirudidel/ata_cancer_guidelines_2015.pdf
    • http://tatasuvuputo.epizy.com/dixifejovuwexi.pdf
    • https://uploads.strikinglycdn.com/files/12eb55cc-0b9f-4ab7-a88e-5533e5e558db/tozidurotofofawizejeko.pdf
    • https://uploads.strikinglycdn.com/files/155a7d07-041e-4ad4-801e-653af423043a/chick_fil_a_nutrition_nuggets_grilled.pdf
    • https://uploads.strikinglycdn.com/files/e9bd55ae-a04b-457f-a3a3-46e75ac2d514/17218545964.pdf
    • http://zazozipuse.rf.gd/74245978649.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_off0000eec9.bin
9cd70e4cf07f70d59a1c5912b197b055550afc5c156cc16fd02ce122771281a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 5456 bytes
font_01_sfnt_off00010146.bin
5bce37447bfb758638b8976b362c98909c45e36d7000771156e78469a4dc6042		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 10752 bytes

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