Malicious PDF — malware analysis report

Static analysis result for SHA-256 af36f18f3ef8d4e0…

MALICIOUS

PDF

86.0 KB Created: 2021-04-17 19:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dacdd1796d639bbb3a3913701b8314f SHA-1: 8c78c540928382532aecb4fa35ebe6594976f75c SHA-256: af36f18f3ef8d4e0fc9b1666d50fe0126b78548e8c77ac06a2a5e9c9d14b72eb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The primary URL, 'https://ponafet.ru/strik?utm_term=ingenuity+baby+swing+batteries', is likely a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=ingenuity+baby+swing+batteries
    • http://jofifuneku.medianewsonline.com/vijafavusaxunogis.pdf
    • https://cdn.sqhk.co/loganidob/2bgejfl/stick_figure_ninja_gif.pdf
    • https://cdn.sqhk.co/rijujonakuje/iiygiwn/used_duck_hunting_boats_for_sale_craigslist.pdf
    • https://minomawisagu.weebly.com/uploads/1/3/5/9/135956859/bumixefugav_lekewexup_diwopugase.pdf
    • http://pusewuvi.medianewsonline.com/ms_excel_advanced_exercises.pdf
    • https://didirivex.weebly.com/uploads/1/3/4/2/134265945/607b7170.pdf
    • http://lozipazom.sportsontheweb.net/crazy_train_tab.pdf
    • https://viwapuse.weebly.com/uploads/1/3/5/3/135306484/3445733.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lakujusitejojet/cuntos_tipos_de_comunicacin_oral_hay.pdf
    • https://s3.amazonaws.com/zevutebulaworel/android_shooting_games_multiplayer_offline.pdf
    • http://wififeju.atwebpages.com/lusexode.pdf
    • https://s3.amazonaws.com/dotivaf/mozilla_firefox_49.0_2.pdf
    • https://s3.amazonaws.com/numunenoji/how_to_calculate_mean_from_frequency_table_in_excel.pdf
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_5dc7968f034a4d71b5bb36e5f5815fc5.pdf?index=true
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_a4a08ac83c2d46939ece07c8a3f613fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75abdeae-149d-4caa-932c-86bc4531577d/51669292738.pdf
    • https://uploads.strikinglycdn.com/files/48f35e95-9706-42dc-b3d5-a90c21713b50/69009393858.pdf
    • http://pudosuvosav.atwebpages.com/assinar_com_certificado_digital_no_mac.pdf
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_11b39261c8fb484c9b8c06b74b8fff61.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5cde62d-6970-4931-ac6c-82230d66decd/18894134793.pdf
    • https://s3.amazonaws.com/zuguvoxoki/gudabaribozu.pdf
    • https://uploads.strikinglycdn.com/files/053e3826-b555-4848-b32b-0337db605234/final_fantasy_7_remake_walkthrough_chapter_10.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_off00011055.bin
893a1810089b421e646e2d01d7b9a482b7b29645406dc1c99da5253da1be2376		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11055 5092 bytes
font_01_sfnt_off000121d1.bin
71d6cf17eafa9024658374ca0044742376274b20c91557ce00004cabdff8a59e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D1 11860 bytes

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