Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3159a72df72cb3b…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 03:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 602e31d455ff4ed35f90aba07c0ee754 SHA-1: 2a92160d56da899e58a1ba181e233cf05cc14d3b SHA-256: e3159a72df72cb3bcee835f083ab9ab121ab5ca0bf55be8c52fc3081791fe904
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9994

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=ap+world+history+chapter+16+study+guide+answers PDF link annotation
    • http://pushbiz.fun/ford_mustang_gt_2016_specifications8fokx.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/hehfThd/zomirepozibubomufiku.pdfIn PDF document text
    • http://indir-kazan.com/how_do_you_get_a_stuck_vhs_tape_out_of_a_vcr6ag9h.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/8dXibTf/netflix_movies_christmas_drop.pdfIn PDF document text
    • https://cdn.sqhk.co/vikaxokaso/ehbjhho/rancho_del_rey_mobile_estates_huntington_beach_ca.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/d7WmKPU/fubikuzudodawukisiwevova.pdfIn PDF document text
    • http://wirelessinfo.ru/the_republic_by_plato_book_2_summarynbx83.pdfIn PDF document text
    • http://rte-ita.fun/22729759214x7si1.pdfIn PDF document text
    • http://uscreditinquiry.info/samsung_un32eh5300_remotek0xyg.pdfIn PDF document text
    • http://riforemepenog.iblogger.org/plant_cell_coloring_biology_corner_answers.pdfIn PDF document text
    • http://form-copyrightservices.com/830281876265jb5i.pdfIn PDF document text
    • http://lg-copyrightforms.com/net_framework_2._0_32_biteawhx.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/6xBNs2n/portal_quest_patch.pdfIn PDF document text
    • http://vostokzapad.su/roland_micro_cube_bass_rx_for_salelxcza.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/aRxjjhI/pinout_for_rj45_to_rj11.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/ahjhcMt/mukesufojexorazo.pdfIn PDF document text
    • https://cdn.sqhk.co/pininipata/jhcvifn/historical_thinking_skills_examples.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
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_5915396baa544005b39dc93fe988a84b.pdf?index=trueIn PDF document text
    • http://bakevojedu.epizy.com/zazejupuduximatorof.pdfIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_a354ec171a9f4ecc88c14325b3550326.pdf?index=trueIn PDF document text
    • https://b1b1ed1d-a631-407f-b8a0-2f609481a9c2.filesusr.com/ugd/3e5895_4bce2155543d45709f1e3179cf527c7b.pdf?index=trueIn PDF document text
    • http://komadolosa.rf.gd/57174163634.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 5608 bytes
SHA-256: 829ff5a4989ada8b63bef698eb1deea37313e499aa2d06630b7e055b58880670
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 10400 bytes
SHA-256: f70cc75205e69a6f59c595f193284f6e0ef9f581b675a35db2b7303b488e2cc8
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361