Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d2fb3cfd48ba56…

MALICIOUS

PDF

78.8 KB Created: 2021-03-14 11:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 317c696775529cbeb253fb122c8231e7 SHA-1: 198d505b3645ae0afa12abbbd734c72100863b55 SHA-256: a1d2fb3cfd48ba56a929dc223b1271bac69a57862b2ae4e505cf8b85df8cf8a4
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 hosting services, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be related to product keywords, further supporting the SEO spam or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wix?keyword=port+replicator+for+macbook+pro PDF link annotation
    • https://rusofejez.weebly.com/uploads/1/3/1/8/131856127/4812421.pdfIn PDF document text
    • http://5coupons.info/how_to_tell_if_a_boat_battery_is_badliapx.pdfIn PDF document text
    • https://ropupapufodugut.weebly.com/uploads/1/3/4/6/134650221/2138509.pdfIn PDF document text
    • https://pofuzopabo.weebly.com/uploads/1/3/4/3/134307265/7cca983e4e.pdfIn PDF document text
    • http://hr-insider.com/22926587662woqmq.pdfIn PDF document text
    • http://rolevuses.iblogger.org/986423546.pdfIn PDF document text
    • http://milanomoda.site/selenixalunawilaxazszpjt.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/9ba2a278-6abe-4ef9-90a7-839188cf7463/zapituwirunuwefojekoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c205cc48-0dea-444c-b3c7-3b5d739050d7/75905868640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5bfff5-bac7-44aa-a7e9-f1be5b9e51bc/how_to_use_a_power_pressure_cooker_xl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9ac5b4-72c9-4b88-9183-4c226d4d19c4/visual_basic_crash_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a109c0a1-a67b-473f-a6e1-b0ed60df2ff0/tadegowewufakuzakofig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3a00e4-abd7-4e7a-a6e3-a739b30acfb3/ernest_hemingway_cat_in_the_rain_trke.pdfIn PDF document text
    • http://nemunuj.rf.gd/google_docs_word_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6436bc31-8fb9-4d8b-b48d-7abdbd5bb73e/lolixiradanawotabagodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f2a5a6-bae3-4cd7-ad93-2788ec5a9759/staples_mailmate_shredder_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6f659c-14db-4def-a138-d28a0f45da9f/how_to_use_a_mr._coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbb0450-5683-488d-908c-dcb5b893f60b/how_to_set_auto_brew_on_black_and_decker_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb780503-a90a-4797-999a-fc6f5082957c/43937929966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91de826-1265-4e5a-ab33-b41dc1d2c9d8/ap_biology_test_prep_book_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1517cd06-cd3c-4920-9e3e-1fbdaf5013a5/go_where_you_feel_most_alive_quotes.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 5188 bytes
SHA-256: 0ab755d0735a3272f404ec31f730e4d6555ccb039531759068d1431efb8d1642
font_01_sfnt_off00010469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10469 11800 bytes
SHA-256: 6058a8176d5db9d16e2fcaf28ca0019eb1aae98a76df2383518644092f1f78d0