Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8be3e07073e736…

MALICIOUS

PDF

98.6 KB Created: 2021-04-05 11:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3ef6d8edcebeeab6ac511231843de14 SHA-1: d5a1c10429352904afea15f6f9083488b9377230 SHA-256: de8be3e07073e73629c9fd272a5df77cc5a3e0457e26ba0d3ae6d9ddd63be79a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's part of a link farm and contains external URIs. The document body, though partially corrupted, suggests a lure related to 'Catalysis pdf file'. The presence of numerous external URLs, some benign and others unknown, points towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/award?keyword=catalysis+pdf+file
    • http://re-capital.ru/what_do_gnostics_believe_about_godi2hnr.pdf
    • https://cdn.sqhk.co/disumuneriva/ghikhju/realpolitik_game_mod_apk.pdf
    • http://rusherx.studio/xekepitulibogorevorelixjxq.pdf
    • http://andyhong.blog/stihl_fs_381wo32.pdf
    • http://carinsusa.info/schwinn_suburban_womens_comfort_bike_26-in_reviewadt0i.pdf
    • http://vogolimipogusoz.mypressonline.com/wuzesivomitalesi.pdf
    • https://xijofufakeziti.weebly.com/uploads/1/3/1/3/131380729/27b668d1a.pdf
    • http://sreda.city/69697494969krhv7.pdf
    • https://cdn.sqhk.co/ribobujir/ajeAjbA/arctic_wolf_sim_3d_apk.pdf
    • https://kinuguno.weebly.com/uploads/1/3/1/4/131454024/6463350.pdf
    • http://jifarobajis.sportsontheweb.net/25535450624.pdf
    • https://cdn.sqhk.co/budajawisore/nxYgdge/gakebedupovirimujakemapu.pdf
    • https://livaruzurakit.weebly.com/uploads/1/3/4/4/134432061/kuvuvopesiditu.pdf
    • https://cdn.sqhk.co/givesaxi/Bjikrig/bingo_run_free_bingo_games_apk_download.pdf
    • http://wusator.mygamesonline.org/37385008814.pdf
    • http://fapasevusiledap.mygamesonline.org/rukudesilaxis.pdf
    • https://kevofogag.weebly.com/uploads/1/3/5/9/135962027/aee67c01ba82d0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://692937ca-140d-46b9-9715-018e108c1018.filesusr.com/ugd/2540a5_e621f294175d43cc92463b96a2642dad.pdf?index=true
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_59de0114151b4fef84f45bae650effe9.pdf?index=true
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_3295e92eb80845b2b344a213e563d6a6.pdf?index=true
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_5f34a6a3833f448abb0c89ca360902d1.pdf?index=true
    • http://dizoran.epizy.com/6633387758.pdf
    • http://kabitivawenavox.rf.gd/93131603666.pdf
    • http://tizexazebubo.atwebpages.com/what_is_service_of_process_new_york.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_off00014039.bin
598bae8eb51467fd85fa3e201834415dea94bc4e3f3acc8db5a0b7a3680ef26e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14039 4948 bytes
font_01_sfnt_off0001512d.bin
314b6d3885f045e0f1d8675dba35368658c7b746be36efa70a5097934cad8b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1512D 13736 bytes

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