Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc1c46f1275f48a…

MALICIOUS

PDF

74.2 KB Created: 2021-04-11 07:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40fff958bc703cf5985c7b0b3e9145aa SHA-1: be2f011e23665426ab4c47ecdbabbb4da8f174e8 SHA-256: cdc1c46f1275f48a73765c2258edc88f0cd1415cd3fcb59e060d9aa3dae6ebf2
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The embedded content, though heavily obfuscated, likely serves as a lure to encourage clicks on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=black+and+decker+12+cup+coffee+maker+red
    • https://cdn-cms.f-static.net/uploads/4421333/normal_60474655b5380.pdf
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fd7954703912.pdf
    • https://cdn-cms.f-static.net/uploads/4506159/normal_600b733d8ea12.pdf
    • https://cdn-cms.f-static.net/uploads/4421960/normal_6031dfb175c8f.pdf
    • http://bivadula.22web.org/kabbalah_mashiah.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_ddb409a4ab0645539c7036d6f086e9cf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9145694d-44d7-4a05-be2f-0f5f4a4fbe54/gutarulu.pdf
    • https://uploads.strikinglycdn.com/files/7fda83fa-03c7-4f44-9ae6-8083fb8079ba/eye_has_not_seen_nor_ear_heard_esv.pdf
    • https://uploads.strikinglycdn.com/files/717cd7a6-b21d-40b6-ba3a-3fce6710f73a/jonubuwupisonokowokaduba.pdf
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_d903c9e2a97347f5b18374fd5ebeea6e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/32950654-0bd6-4a4a-be4d-a4516ec550d6/wigejobadapi.pdf
    • https://uploads.strikinglycdn.com/files/cb7e2d8c-b99c-4b4b-896b-314a1b72b83a/14311389521.pdf
    • https://uploads.strikinglycdn.com/files/f3797ac3-68f1-4f05-a362-bc133fab0b10/71878002596.pdf
    • http://mezuvisudaduvo.epizy.com/sosobegesokulo.pdf
    • http://nopexuwub.rf.gd/horizon_zero_dawn_data_point_guide.pdf
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_aab9242c8846469e8d38d5eeb537b6bd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a305cb82-eae9-414b-9499-67d465344604/bmw_sat_nav_6_manual.pdf
    • https://uploads.strikinglycdn.com/files/866e254b-ecab-42d5-a663-bdc8b9a61926/conceptos_basicos_derecho_procesal_civil.pdf
    • https://uploads.strikinglycdn.com/files/55a41620-80ff-42dd-a319-6e6cf5c4e9bd/miwemimusobajebalod.pdf
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_85046e3f0f78430aab2ecf11e50fdd8d.pdf?index=true
    • http://dodigemadepa.epizy.com/lion_the_witch_and_the_wardrobe_characters_costumes.pdf
    • https://uploads.strikinglycdn.com/files/c9ef592b-8f05-4d31-adcc-f174387ff11e/3027802464.pdf
    • https://uploads.strikinglycdn.com/files/c3eca36f-dd87-4728-b6d2-ea60560ea688/economics_mcgraw_hill_online_textbook.pdf
    • https://uploads.strikinglycdn.com/files/32a0c0a7-8447-465a-b515-1722fdd768c0/nederadusivawipesetewetof.pdf
    • https://uploads.strikinglycdn.com/files/3d246f88-e3f4-45c6-90fe-995bb2000229/how_to_fix_a_cuckoo_clock_pendulum.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_off0000e355.bin
51bd152ed3dc0b4dbd4f3d58fdb3d5fd498980f4417066230d23b1cccaf6309d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 5420 bytes
font_01_sfnt_off0000f5b9.bin
de76a0876a8d0687a485ae9e049726e4da35bc2b3074a6138418a0ef0abbd786		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 11076 bytes

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