Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f440d77ae3edd13…

MALICIOUS

PDF

73.0 KB Created: 2021-03-24 00:53:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1047b63fd567b897bc48e731463ebf1c SHA-1: 5f98dbcd45990ee2991c62880fc78b55d9a8f84f SHA-256: 5f440d77ae3edd13f4d0afa49704daa8a69527304d6ffeb80d34f5c0db8c415f
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://bologen.ru/wix?keyword=download+happy+wheels+full+apk', indicates a lure to download a game, likely a pretext for malware delivery. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=download+happy+wheels+full+apk PDF link annotation
    • http://nepatokada.mypressonline.com/lemaruroli.pdfIn PDF document text
    • http://istra-backwater.ru/25348595081tgfu4.pdfIn PDF document text
    • http://re-capital.ru/how_to_solve_a_rubiks_cube_stage_5fvnfu.pdfIn PDF document text
    • http://matras-24.ru/bst_dongle_latest_setup_3._50bi4k1.pdfIn PDF document text
    • http://kindraretterath.com/985391450555xdn5.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/childrens_islamic_story_books_online.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/zozazakarukuvatujo.pdfIn PDF document text
    • http://soldatskaya6.ru/blender_export_animation_jsonkqc6z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://benamow.myartsonline.com/what_is_the_military_code_for_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/44987318967.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_7bdf6bd755234754bbb8af963e8999ce.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_e34cda7f61634294bc8530decf3d0b04.pdf?index=trueIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_ee026a54fa3d4c94811a9972e08594b6.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_7d437259ce2e4744ae0aa950f6a68a65.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_f43ee87ec21d46088d7fd86f5a3c7801.pdf?index=trueIn PDF document text
    • http://muvekalufisu.atwebpages.com/harman_accentra_pellet_stove_insert_igniter_replacement.pdfIn PDF document text
    • https://8aebee23-f0ec-44bb-9168-030d5632d650.filesusr.com/ugd/48d9a1_6143261f89f74141862523530a35a80f.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_d793a20a4e1a4175b04bd25a3393f136.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/front_camera_icon_disappeared_android.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5292 bytes
SHA-256: 5dc6d2eaf311308f8fcc085ac906d0f832097fb5f28469278f4d7e096c2bc8ae
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 10204 bytes
SHA-256: e4bde755d7a634538eb07f9a5bf44149410fcb1752a3fd5be24b41774df13c13