Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2045380c3de47d…

MALICIOUS

PDF

75.7 KB Created: 2021-03-20 18:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97c0f488c0f9958cd377cfd602414d13 SHA-1: 2f3cc7e0aba380d74dca221fb7cbd5b7f9173c49 SHA-256: 6d2045380c3de47db1414f7f2b7e9630204100e7fd63711fe0bb002251a37664
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to generate SEO traffic. The primary external URI points to a URL that appears to be part of a malicious campaign. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=4+main+physics+equations
    • https://cdn.sqhk.co/pigevikuwi/TgfJUij/what_does_icymi_mean_in_texting.pdf
    • https://cdn-cms.f-static.net/uploads/4413846/normal_604e08b50767c.pdf
    • http://dipenoguzel.sportsontheweb.net/machine_learning_reader.pdf
    • https://cdn-cms.f-static.net/uploads/4458837/normal_5fdba9b218708.pdf
    • https://cdn.sqhk.co/xagaxubibiz/Qigif1y/30649997042.pdf
    • https://static.s123-cdn-static.com/uploads/4489032/normal_5fca058167f0d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xukonakefules/kiziwijaponapureputerelak.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/spoken_english_practice_tests.pdf
    • https://s3.amazonaws.com/widetunipet/zedanurosorewuwixapixan.pdf
    • http://vefodipox.myartsonline.com/ziziboderumivokig.pdf
    • https://uploads.strikinglycdn.com/files/822f5a19-cd4e-4a27-a311-06083caafbc5/zejopebasiwiwugopiduf.pdf
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_fddcbc96afa043a1bbcc71637953589d.pdf?index=true
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_ea714ab4c08444229be68793a26848be.pdf?index=true
    • https://s3.amazonaws.com/xunilukegez/starfall_learn_to_read_apk.pdf
    • https://uploads.strikinglycdn.com/files/6d6f779d-fcb6-4193-b773-d2aef9dddc09/how_do_you_replace_a_rotary_switch_on_a_floor_lamp.pdf
    • https://uploads.strikinglycdn.com/files/7c35aec1-fa63-4d42-ba0c-f962e5c4e4f8/lola_lago_vacaciones_al_sol_english.pdf
    • https://s3.amazonaws.com/tisegovofu/what_are_the_merits_of_capitalism.pdf
    • https://uploads.strikinglycdn.com/files/1914dee7-459d-43f9-b3bb-a553b4b11df6/how_to_set_sleep_timer_on_sanyo_tv_without_remote.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_off0000e9e6.bin
6349406bb2d80e0a5cb0f24d0cb3e817b912ff3005238cc53161ac65bc63d64e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 5268 bytes
font_01_sfnt_off0000fbb8.bin
77d603b7d4897626195a54d9bd3616fb5fac624797d9e5a96e7035e95e3bc8ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 11120 bytes

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