Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce58698b017e1c6…

MALICIOUS

PDF

84.3 KB Created: 2021-03-17 19:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 99802fdb229370f8180fce03bd6ab630 SHA-1: bba552163e0a267bf1df753c91dd46cb254d9530 SHA-256: 7ce58698b017e1c6898ac4a1bf17d8d90750c433f3c8d1b4c98ec931bf92adf4
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier strongly indicated maliciousness, and the embedded URLs point to potentially malicious content. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious or spam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • 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://gimoguvi.ru/award?keyword=teori+marketing+public+relations+pdf PDF link annotation
    • https://cdn.sqhk.co/benibavagoge/yhakhij/word_with_friends_online_login.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/kZWhgjh/school_of_dragons_gems_generator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/jbZaLVn/fridge_magnet_photoshop_template.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/outlander_series_book_8_synopsis.pdfIn PDF document text
    • http://keepxufi.space/how_to_make_yourself_miserable_dan_greenburghnyr7.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/cW3haXU/life_simulator_3_real_life.pdfIn PDF document text
    • http://003-center.ru/how_many_eggs_can_i_eat_on_the_10_day_green_smoothie_cleansenqh4x.pdfIn PDF document text
    • http://fadewujetenuve.mywebcommunity.org/ls_dyna_ale_examples.pdfIn PDF document text
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/gizabu_namegudejofeba.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/satipefaguzoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/jbdA52R/zumirawuwufatejol.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/vazotogitog.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/marla_maples_today_2020.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/69736184349.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://benamow.myartsonline.com/nirawobejinojizovonixido.pdfIn PDF document text
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_9d9db1f2b8cf414fa183a0c58e154eee.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_3f82bba453ed49cdbeb61f35ed291927.pdf?index=trueIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_fa243aa3030b49689dcd5e9e65a884f5.pdf?index=trueIn PDF document text
    • http://nakeviw.myartsonline.com/luxaradimagogetaxabekibam.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_24f2d282b9694310b5c10d3bdf5339f1.pdf?index=trueIn PDF document text
    • http://redifigikutusoj.myartsonline.com/patch_antenna_book.pdfIn PDF document text
    • http://fazobelo.onlinewebshop.net/rifejemukomubi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 5508 bytes
SHA-256: a138e65bb1bd85d1c40907598df839a2f437a9a823dbc94c966b158f37b6e527
font_01_sfnt_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 11308 bytes
SHA-256: 756101437f40f80bb064d390a5b509331390bb1bfbb002db974ac11407b2f82f
font_02_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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