Malicious PDF — malware analysis report

Static analysis result for SHA-256 3837d42fd0d5a3e6…

MALICIOUS

PDF

138.3 KB Created: 2021-03-22 19:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f87ad27a3eb1877ef52a5a2fe5d063e SHA-1: b727f012ec2808034c4609eb353b238c0a3c7e8d SHA-256: 3837d42fd0d5a3e6bf4a0b7b55d8fae083035a83cebb6ba086311b1d612e699b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on suspicious domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/award?keyword=re+art%25C3%25B9+e+i+cavalieri+della+tavola+rotonda+libro+pdf
    • https://cdn.sqhk.co/zapiseniw/ejbifvE/jufaboturawopusulis.pdf
    • https://cdn.sqhk.co/fenazijeguk/ezw7gcE/vertical_runner_brecksville_hours.pdf
    • https://cdn.sqhk.co/giwitosak/1ZhaZKd/plural_form_of_armchair_in_french.pdf
    • https://cdn.sqhk.co/gazejuruni/CpggY6L/vogopof.pdf
    • https://cdn.sqhk.co/lamidipeke/gj0JAZM/98969558277.pdf
    • https://cdn.sqhk.co/fegukajebaj/YjfTa7L/fupitinemigitejonijaj.pdf
    • https://cdn.sqhk.co/vamunidibu/ghbRiaa/45182241787.pdf
    • https://cdn.sqhk.co/xekutenupi/ihihlgg/simple_model_boat_plans_free.pdf
    • https://cdn.sqhk.co/bamebuxi/ihjjhjh/67577793667.pdf
    • https://cdn.sqhk.co/rozopebak/8ifk4hg/rocket_launcher_fortnite_location.pdf
    • https://cdn.sqhk.co/tuturuno/Wihggij/minecraft_galaxy_lucky_block_mod_1._12_2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vasofirida/98721403384.pdf
    • http://guduzexotozi.rf.gd/46720365801.pdf
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_035d70c1e09a4ba7b76151e37c4e794d.pdf?index=true
    • http://webubekesivamuf.epizy.com/78532331097.pdf
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_441bbec5533748b6abf7efa5453d30d7.pdf?index=true
    • https://s3.amazonaws.com/tufitijinexu/comment_fusionner_2_en_un_seul.pdf
    • https://ce5d016b-e5fb-4004-af8f-35f61b829e22.filesusr.com/ugd/d7d7f8_d301162c866043b88cf2b4f685fc0382.pdf?index=true
    • https://s3.amazonaws.com/viwoxuz/dakulatopukevudolagoduziv.pdf
    • http://kebanibaru.epizy.com/20692748141.pdf
    • https://s3.amazonaws.com/tokit/pokemon_x_game_for_android_free.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_off0001ded9.bin
b4690b714b6c0a6a947a2af2e71bffd62e1d5970ae3695c3204aa8147affdc77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DED9 5296 bytes
font_01_sfnt_off0001f0bf.bin
4091653a4686af0d01600e0611a6b1dfebdd4013dc7f4557110ebefd0e11bee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0BF 13184 bytes

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