Malicious PDF — malware analysis report

Static analysis result for SHA-256 2465c81fce300aa4…

MALICIOUS

PDF

68.9 KB Created: 2021-04-03 10:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 28e0e7b6e9dbf5f919b0e72c77ddfc83 SHA-1: 541b61a150d129128a8eace29e7c4764846261f1 SHA-256: 2465c81fce300aa452bdb5376d2f62dca1996453d447de02bb7c69361f69e963
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 0.9998

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://fokemale.ru/wix?keyword=aetna+medicare+otc+catalog+2020 PDF link annotation
    • http://neojust.ru/starting_my_own_clothing_line_redditi9okw.pdfIn PDF document text
    • http://newyearshop.site/supreme_commander_2_revamp_moduc1xo.pdfIn PDF document text
    • http://tb-films.ru/77231404663d5dzw.pdfIn PDF document text
    • https://tifomuzaki.weebly.com/uploads/1/3/1/1/131163977/datopizotije_fojuwukuw_lanajawofi.pdfIn PDF document text
    • http://bitjoms.xyz/61125569129d6ag5.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/pujajedu_felogunamanaz_kumojofuzez.pdfIn PDF document text
    • https://matazesugol.weebly.com/uploads/1/3/4/7/134702103/9ae30023f80.pdfIn PDF document text
    • https://paruvinuj.weebly.com/uploads/1/3/5/9/135970142/ketumugazojagil-zuvipajufi.pdfIn PDF document text
    • http://weraka.online/the_book_thiefy9wda.pdfIn PDF document text
    • http://betmoy54.com/46507871463s74og.pdfIn PDF document text
    • http://bigtittybella.com/panasonic_microwave_oven_nn-sn686s_stainless_steel_countertop_built-in_with_inverter_technology50sw0.pdfIn PDF document text
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/melipuge-dadabapod-xabepotofuvidi-berimidelatat.pdfIn PDF document text
    • https://xuduzaximebawu.weebly.com/uploads/1/3/5/3/135315026/tesaxiwesenak_mikoko_kabegajiworuja_tabifidafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_72f126ef22004f5fb531c4b945eb824f.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_3d1b3a26deed49449e1b920e977602c7.pdf?index=trueIn PDF document text
    • https://6e337ffa-6c75-4e98-916f-0cab85e7e3f5.filesusr.com/ugd/a22560_a6003295301241bcb118a1b0c8c12797.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_62fa956b493c44c88bdab3e0eec82685.pdf?index=trueIn PDF document text
    • https://e53c8fcc-339b-4d8f-83f6-44ddc8c6ace4.filesusr.com/ugd/1ea9c4_832e44b5f639402d9c4048c3a33ec344.pdf?index=trueIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_e6267e8ada1f4e34946d655ce5134c93.pdf?index=trueIn 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_off0000d019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD019 5344 bytes
SHA-256: b87036c5c1637c73fcee007b298c42cd14d439e0a8a10eaaf3dc56a8280e7270
font_01_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 10564 bytes
SHA-256: 06a19e3ff4bbb34b989c3ef9cc0163107c7980f07650ed09dcea8a645b1febaa

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