Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59942b757f65b94…

MALICIOUS

PDF

74.3 KB Created: 2021-04-05 17:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d88e0326d2fc7b74ebb066ed7b5e5719 SHA-1: 27b419543427322c0b87e964dc4948be043b6b3f SHA-256: e59942b757f65b94e3e53dcb1edb10e1687f3867fe4a6a2cd58cf19efb330b9b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting services and employing UTM parameters, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=oppo+105d+netflix+4k PDF link annotation
    • https://webemimerur.weebly.com/uploads/1/3/1/3/131380848/liwijosu.pdfIn PDF document text
    • https://fadegedisumobe.weebly.com/uploads/1/3/5/9/135992854/libixipijubu.pdfIn PDF document text
    • https://mizabago.weebly.com/uploads/1/3/5/2/135299272/tulaguvotid.pdfIn PDF document text
    • https://komijeji.weebly.com/uploads/1/3/1/6/131606126/zalol.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/sibigiwovivinumepu.pdfIn PDF document text
    • https://vuwarudud.weebly.com/uploads/1/3/5/3/135314702/189714476f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/daxemo/pasekuzigalikof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdff9bbd-b106-4cc6-b6ec-d1713ed402d6/xiduvepoluzinekegexekun.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_09594cbb09484bfb9c2ccf9286726599.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/39396389959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2acd000b-cb1a-4268-ab7e-43845e34fe4f/how_much_do_screenwriters_make_in_residuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ea40a50-7a87-411d-8649-77de17d2c089/reported_missing_season_1_episode_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a856aafa-2242-4265-960c-87d902911ea2/golukamaxakuvufin.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/bulldozer_inc_java_game.pdfIn PDF document text
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_949312a0e2c14e90a3583a5b427d0587.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/93824567207.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/wisekumeb.pdfIn PDF document text
    • http://begujewirefe.myartsonline.com/oxford_latin_dictionary_abbreviations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a88b4f8-5d68-4c61-afdf-a137895b7987/mutomewiv.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_dc35ae8638e44caf86fcd0077a23e62f.pdf?index=trueIn 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_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 5116 bytes
SHA-256: cea5004f94840df9e06a8cac34a33b53342e05f40082f1d267757384220113c7
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 11712 bytes
SHA-256: 0854ce3155b4d8d3fe6bab70204dcc1e9395a0e7946df04d20c8fecfd6ea4e0a

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