Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc2c6f8c1c088a9…

MALICIOUS

PDF

77.3 KB Created: 2021-03-18 10:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: d385ab62321e3715a5a8706f852379f9 SHA-1: 8b554fe85764f899891273a9e5e6cd22536c5055 SHA-256: 8bc2c6f8c1c088a9537a7bceeb5660d9a87aa074902f6b22562b3d37bc6e6af0
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of external links, and 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' confirm its malicious nature. The document body, though truncated, suggests a lure related to a 'formal leave of absence letter request'. No scripts were extracted, but the presence of numerous URLs points to a redirection or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/123?utm_term=formal+leave+of+absence+letter+request PDF link annotation
    • http://ekzo-fruit.ru/37944133810n40c3.pdfIn PDF document text
    • https://midumusifefo.weebly.com/uploads/1/3/5/4/135401272/8621625.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/illinois_real_estate_broker_license_renewal_requirements.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/xolesomasor-gadunaluxe.pdfIn PDF document text
    • http://thedefenseforge.com/5th_grade_math_in_focus_workbooksujru.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/87037839253.pdfIn PDF document text
    • http://job-finder.space/vovogozarodowizdrs0o.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/d37022dd.pdfIn PDF document text
    • http://daddytestit.xyz/a_song_of_ice_and_fire_5_book_set_vs_7_book_setzljgw.pdfIn PDF document text
    • http://pifafixejizigu.scienceontheweb.net/27812025887.pdfIn PDF document text
    • https://bonavipopugob.weebly.com/uploads/1/3/2/3/132302892/rarunumupagikuko.pdfIn PDF document text
    • http://vitrinachel.ru/what_kind_of_oil_do_you_use_in_a_poulan_electric_chainsawnejxu.pdfIn PDF document text
    • https://fevepoxopimumu.weebly.com/uploads/1/3/2/3/132302951/5d4e33c02554.pdfIn PDF document text
    • http://rogevunesopu.medianewsonline.com/artistry_supreme_lx.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/14416542205.pdfIn PDF document text
    • http://alania365.ru/the_black_hand_chris_blatchford3wpti.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/nobikibe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visunes.myartsonline.com/we_gonna_party_like_its_your_birthday_song.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_faceb5c7647449ae9eaccc7945b013ee.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_f037547083724408b7d0875d8d2774a7.pdf?index=trueIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/61911660233.pdfIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_45664af640dd44e598c46b5ed411dd66.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_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 5308 bytes
SHA-256: 445b867fa03f56b68fade0207e6368249971a9809bbcc4062133c4cd1d3be321
font_01_sfnt_off000102f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F3 10688 bytes
SHA-256: 0cdc4afd55f8624d88a2a1e3469d68a5e84ee881a8c16cee7afc05274aa42913