Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc264e4ee85f126…

MALICIOUS

PDF

82.3 KB Created: 2021-04-04 16:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3e6fad438953604a99321e03c1620370 SHA-1: d6744b16436dd92acd7c8937ddf0433b18124788 SHA-256: 1bc264e4ee85f12662a1386fd189b2543501f9aa3c217a6a55ba2a593cfe6642
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/strik?utm_term=why+is+my+maytag+dryer+not+drying PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/piradi/bonetown_pc_game_free.pdfIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_98fbbb26d7aa49fc976c5d1fe667ed1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/l_c_d_of_full_form.pdfIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_5c07e0beece74110a1b1d9fe0cd11d09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/buxakuvagerotaj.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/nejefizowemutovevurak.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/36667702619.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/java_jdk_version_8.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/10703191664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dccb37a-8e57-4f0f-8abf-2ae94f59f091/does_splat_bleach_make_your_hair_fall_out.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc568d2-49c5-4a80-afc9-686e3640ae5a/help.apple.com_iphone_6_plus_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/what_does_gnosticism_challenge.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/basic_electrical_engineering_concepts.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/44764455805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94bbf5c9-3e11-4afc-85d3-2d5c5ccdc888/suxoru.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/how_to_write_on_concrete.pdfIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_dcea11efb9404e81a72dbc5afd040a48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/1998_honda_shadow_1100_battery_cover.pdfIn PDF document text
    • https://5145f1b1-3202-4090-a8a2-79a8bebad775.filesusr.com/ugd/89b1bc_ba809261b00d42b1ae889cf807fc9ef2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/crossfit_hero_workouts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/how_to_set_up_voicemail_on_lg_phone.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_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 5324 bytes
SHA-256: 4abef9facd24feadbf354baea6afc06a054c3aa60529626cb9b99e7076a46445
font_01_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 10988 bytes
SHA-256: 9a57127eb3b1938e76acb90e7452f2671532f190bf2178cc16072e0f037a79a6

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