Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a5082083e0a4b7…

MALICIOUS

PDF

102.5 KB Created: 2021-03-04 15:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 504b067c840f03ffb4c3699e55ff7e30 SHA-1: 14a5bb8e6aea917577d1026d0b95a205f1c41ecc SHA-256: f7a5082083e0a4b706219e45a9ffa7360f34e3f531f53cf4ae7091474662fb4f
126 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links to various domains, many of which are hosted on disposable or low-reputation platforms. The primary lure appears to be related to 'Petsafe feeder f02', directing users to a URL on 'soxebez.ru'. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to redirect users to malicious or spam-related content, likely as part of a broader SEO spam or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://soxebez.ru/strik?utm_term=petsafe+feeder+f02 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423429/normal_5ff2867793b97.pdfIn PDF document text
    • https://cdn.sqhk.co/subilikiwi/YEhbXhg/sharpie_color_checklist.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/Pgfmg9L/61073914451.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/4773173.pdfIn PDF document text
    • https://cdn.sqhk.co/gakilofod/f6Vjbsl/player_guide_for_unknown_battlegrounds_pts.pdfIn PDF document text
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/nimibuta-xakuvup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404500/normal_6007fc46e296c.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/3579125.pdfIn PDF document text
    • https://lobodilogiji.weebly.com/uploads/1/3/1/3/131382226/dutejozinekiluk.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/gjigP2j/31935964458.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/5NieDie/clash_of_zombies_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/hrggUlC/77184350029.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/0gcb1Ka/xebav.pdfIn PDF document text
    • https://cdn.sqhk.co/virurewev/Do9a3ic/download_pc_games_88_snow_bros_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402250/normal_5fe2554687b1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373240/normal_5fde275d97366.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/3a6ecf40-b6bf-4df0-9e04-22c1450dd5aa/what_is_social_constructionist_epistemology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a67b90-6d49-46f3-ae24-1a8a853a3cf1/how_to_repair_a_remote_garage_door_opener.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d3fcb1-cf79-42f7-8d28-5cddacd1062f/bbva_compass_bank_auto_loan_payoff_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa1fdd9f-9df9-445b-92ac-47f858ce9347/chocolate_dachshund_puppies_cost.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_a1bc75260ba846fcabf7972dd51726e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c84e9411-8dfb-4d5b-a978-7ab7f6c22a30/brady_handimark_portable_label_maker_manual.pdfIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_4e1572f3e1e04d89bc20c133995071ab.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_off00015510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15510 5144 bytes
SHA-256: da90118bba2f3a868403765d3972020921b20fef155cfac4a47ac8a1d167656d
font_01_sfnt_off0001669d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1669D 11264 bytes
SHA-256: 93de315730f3b0f6ad73707ebe4ec051744e0e0c1053806dd4be22464da0b4c6