Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b104cd6f420ee36…

MALICIOUS

PDF

78.6 KB Created: 2021-04-03 11:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 97061cf315ef57a0e3e0ce1073483e35 SHA-1: 209f3f9cc83cadc33ee9f16d2921fa0c929cab40 SHA-256: 9b104cd6f420ee366bc09b42253be68c573ec9d933c2c163e3b783a45fdfd586
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains multiple embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'https://crophysi.ru/wix?keyword=minecraft+apk+indir+1.16'. The document body, though heavily obfuscated, appears to reference 'Minecraft apk indir 1.16', suggesting a lure for downloading software. The presence of numerous links on disposable hosting further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=minecraft+apk+indir+1.16 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4470836/normal_604946d4be499.pdfIn PDF document text
    • https://cdn.sqhk.co/puroneruk/gii4hhc/58615464344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5fcd2902624d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367922/normal_5fe4a96241688.pdfIn PDF document text
    • http://tesapewuj.22web.org/biwirirakitusuvesi.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/jfgijcZ/98621441817.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/hjjjhfw/nitro_rc_car_price_in_bangladesh.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/7lhjTOy/flight_simulator_2018_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/VZy7Dhb/wijavekapukelavulugikaf.pdfIn PDF document text
    • https://cdn.sqhk.co/nunewole/dibJWij/54143822310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380705/normal_5ffda3555e9f9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fofifalog.rf.gd/poraxixisofaxagexad.pdfIn PDF document text
    • http://gotulitedovolen.rf.gd/albite_anorthite_system.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/how_to_find_p_value_from_z_on_ti-84_for_two_tailed_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61e6df7-9983-4754-8bd0-3378a334c030/computer_programming_for_11_year_olds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2cf7ff-51a3-487b-bd44-3e82aaf719c7/12439368591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edbae69d-0c1c-47ac-b4af-c00de6d6f887/what_is_another_word_for_best_interest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7268a58d-111e-4d5a-ac29-c639252a75b2/3323529476.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/lg_front_load_washing_machine_leaking_from_door.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_off0000f641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 5248 bytes
SHA-256: 158a83e4b364ff9a76049316f52344d16219619b650317080911476a1fd007e8
font_01_sfnt_off00010844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10864 bytes
SHA-256: c2832c658c277acd58e341a3bf7fcda9b638059c56ff49cfb135ec74d4acb228

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