Malicious PDF — malware analysis report

Static analysis result for SHA-256 743619a2c2ed190c…

MALICIOUS

PDF

80.3 KB Created: 2021-03-17 15:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9463f15aa449b80b524e6783a645aa0 SHA-1: 904554a109388a3246462ffd7e9670b248156a18 SHA-256: 743619a2c2ed190ccd1772bf116ce2f01f17e00658e02b66b259a05b2bff44a4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a critical heuristic specifically flagging a mass of external PDF links, suggesting an attempt to direct users to potentially harmful content or phishing sites. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and heuristic firings strongly indicate a malicious intent to redirect users.

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://golowaki.ru/wix?keyword=ambiano+toaster+oven+aldi
    • https://pipefedib.weebly.com/uploads/1/3/1/3/131383483/fikonujita-bawipekadokegok-pewigoluroke-kebonaxeretu.pdf
    • http://nezolalapiwok.22web.org/english_to_spanish_phrase_book.pdf
    • https://cdn-cms.f-static.net/uploads/4464313/normal_6025b3a3bf47c.pdf
    • https://dexidete.weebly.com/uploads/1/3/5/3/135394420/sekiz_lefixugi_zutodo.pdf
    • https://cdn-cms.f-static.net/uploads/4446034/normal_60391f131b113.pdf
    • https://cdn-cms.f-static.net/uploads/4372371/normal_60317da1511e9.pdf
    • https://cdn-cms.f-static.net/uploads/4489050/normal_602c2f035414a.pdf
    • https://cdn-cms.f-static.net/uploads/4422371/normal_6022eb3706390.pdf
    • http://vugezaselefobop.iblogger.org/the_animal_movie_tamil_dubbed_free.pdf
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/lukinozesapogif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nipaxuwibaket.epizy.com/stairway_to_heaven_lyrics_by_ojays.pdf
    • https://uploads.strikinglycdn.com/files/100f9676-01f2-4587-9a63-1b05bff4b2fe/whats_in_a_subway_club_salad.pdf
    • https://uploads.strikinglycdn.com/files/9f5a30db-a1b2-4244-ad13-6ac5337e3bbd/jifusifebifaberilapube.pdf
    • https://uploads.strikinglycdn.com/files/bdb58184-6796-45e4-916e-d6bf09f6d8b4/dizuzubabijaxokinatogemi.pdf
    • https://uploads.strikinglycdn.com/files/84b38fac-51eb-4f6d-a360-fb0ae8f7f0e8/oster_total_prep_2.4_l_10_cup_food_processor.pdf
    • https://uploads.strikinglycdn.com/files/4cb8bc8c-c757-4a47-9a57-da15c77ad217/informative_speech_topics_for_high_school_students.pdf
    • http://sixosotonipo.epizy.com/38122264603.pdf
    • https://uploads.strikinglycdn.com/files/82d038ed-63a5-4588-82e1-0a0868eea861/how_to_solve_completing_the_square_with_fractions.pdf
    • http://samepuwewar.rf.gd/reasons_why_my_ac_unit_is_not_cooling.pdf
    • https://uploads.strikinglycdn.com/files/f1db4046-af40-4cfb-966d-3b5471f9abf5/appliance_repair_no_service_fee.pdf
    • https://uploads.strikinglycdn.com/files/4288cce3-f0c6-4fed-b0af-4aa0f63f4db5/exceptions_to_the_fruit_of_the_poisonous_tree_doctrine_include_quizlet.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_off0000fda1.bin
f1b4e8e1f5c2833b4e97b6d5d5c96d8119b8d2cc8c42b1912d0cb185b935bfc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 5160 bytes
font_01_sfnt_off00010f15.bin
2f5b22a7cc310fb1100aa2bdffd08bc32aeeb841a8d4b1fadd3c69ec9c725f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 10824 bytes

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