Malicious PDF — malware analysis report

Static analysis result for SHA-256 deed442e50152487…

MALICIOUS

PDF

78.3 KB Created: 2021-05-03 10:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 091650cff6bc30f807a5f98f7ed97094 SHA-1: f9b69e77a3db4875ca07a2b12d2319e8f8ea252a SHA-256: deed442e50152487f96022dacc000f5aa0f5d2a49dce304d93a7a71b49c6d864
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'basic english grammar book 1 answer key pdf'. The presence of embedded URLs indicates an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=basic+english+grammar+book+1+answer+key+pdf PDF link annotation
    • http://5coupon.info/what_does_the_term_religious_tolerance_meanmkvsx.pdfIn PDF document text
    • http://gallery-shop.site/398595538267x0gz.pdfIn PDF document text
    • http://voztrans.ru/7th_grade_math_reviewc7tw8.pdfIn PDF document text
    • http://cocobeautybar.ca/audiovisual_translation_subtitling_translation_practices_explainedm6vox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://43e59f28-96d7-4988-bcd6-55bc25f76e69.filesusr.com/ugd/372bdc_359b0892caed4816a2880f48da28751a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf9c4b1a-470a-4a60-a6de-c7459534d73c/66006299059.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_06a85df4bf3942d085b3a8b483a33bb3.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_ce2252972ee241d2b3afa828f1510114.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd84c6cb-b2d1-4b63-a725-0e527d08101e/2006_gmc_envoy_power_steering_pump_replacement.pdfIn PDF document text
    • https://8a05da06-75fd-4b4b-8779-f7668a2fa4a0.filesusr.com/ugd/da32d9_6d0dc39dcaf8409aa9321417d10eda23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/902b0dc8-5e07-4e4c-a55d-e446016b8b59/how_to_change_toner_in_brother_printer_mfc-8480dn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ccb480-a48d-4262-94e0-eb8d8db05d55/is_a_2008_ford_escape_a_good_used_car.pdfIn PDF document text
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_9ebece6940bb43ad95c05151e22f1069.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/gokogopupagibogafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7202d24a-02a6-4ed0-981d-83340bb18a75/48207737583.pdfIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_f15d97a00ee14cd2930f7df411bb4299.pdf?index=trueIn PDF document text
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_df28041969394a6791335718df1863ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nokiva/lawewogodevatizawexas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb8e601-3de7-48a3-a611-f8b3b149f390/xelisikafoxogosijusoli.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE56 6068 bytes
SHA-256: 635c6d093c1b1c592c91695a1b65d6b3268406420142c593757c530865132d37
font_01_sfnt_off0000e2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E6 17128 bytes
SHA-256: 1f8905b13ab49a5c88b81184484b85f55d6a9811445e3133a6b8c9e515e49a6a
font_02_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 17732 bytes
SHA-256: aa1f3e733760371c0342bcfc16dfd7111f36ccc6b3e8f4c2de580bc11ff6e945

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