Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddb87c2fe27f98f…

MALICIOUS

PDF

76.2 KB Created: 2021-03-25 04:45:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2cded58ff140905cd322dc06543fa067 SHA-1: 4675d81afcb70c7b6cac3b52b3900db82f532ddc SHA-256: bddb87c2fe27f98fa50d6ce04258e8cd53bea5322df5535b3cfb81a6e4c6c1f6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO poisoning tactic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards a phishing or malware distribution scheme, likely using the document as a lure for users seeking specific software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://resalured.ru/123?utm_term=audatex+program+free PDF link annotation
    • http://mon-cmbretagne.com/suntrust_mortgage_payoff_mailing_addressdvmnb.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/rixosurezuxixajeser.pdfIn PDF document text
    • http://instapriz24.site/avery_5160_template_google_docswmjq7.pdfIn PDF document text
    • https://cdn.sqhk.co/zudatona/gijfgeJ/toy_defense_fantasy_td_strategy_game.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/what_are_the_key_words_for_multiplicationbv453.pdfIn PDF document text
    • https://cdn.sqhk.co/wetabupi/6giBjaw/vonofafisulifosig.pdfIn PDF document text
    • http://rte-ita.fun/quantum_chemistry_textbookbnuip.pdfIn PDF document text
    • https://cdn.sqhk.co/murajefovel/jdjcsif/word_insert_square_symbol.pdfIn PDF document text
    • https://verorepu.weebly.com/uploads/1/3/4/7/134774070/4768290.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/woodshop_projects_for_high_school_studentsdman1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71471142-4286-45a4-a6a2-a9c5a27bd50d/gofaguwefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8018de-2c2c-40b7-ac98-254b3a56b913/43136152650.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_53d7188b52024ae28de8407fc8c34b90.pdf?index=trueIn PDF document text
    • https://e21f0dd0-e693-4a2a-aa38-6cab66162128.filesusr.com/ugd/34eed6_96112cb76d654256a21ab09f799caa6b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a664584-ccda-4404-8f43-6211ea7b8d27/lopi_liberty_wood_stove_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6e2e19-b891-44b2-8635-64fe30deca16/what_defines_a_direct_democracy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91176463-186e-43cd-82c4-8c06cce7917e/mukoduselepo.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_74290dc79b0c4493bb4cd679a6a89cdd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/273004fa-b3a8-492a-97cf-0d5712d3f955/pufuzawogubowaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92271e9a-e1d7-42b1-8ae9-a6be9086673f/fawelonovodikuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9019fa9d-b6ef-4e65-9e51-9c4b23482cca/rekudapivatozofifokopomip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7ba248-d3c5-4594-9ac7-3d4262a302dd/dark_heresy_character_sheet_fillable.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_183e4adf173741e5b9119f666754bfc2.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_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 5208 bytes
SHA-256: 1721d36ffd7f677bda6f55d4916cbf06ccb0512fb04354e0f5e86828728073e8
font_01_sfnt_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 11456 bytes
SHA-256: 34d18c44fffe6846469e01bc3ae895567cf89a1fb08c5239b6c3a4f16c0cc6d8