Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d699a1b13fcce0a…

MALICIOUS

PDF

80.0 KB Created: 2021-03-17 21:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 27ef2cca6fc315c7d0e23caca0a2d54b SHA-1: 16facb7061693862b8d46e92990666b7ed58df31 SHA-256: 7d699a1b13fcce0a343edef219e4209a5efecf735b06aa6cd6e4c7222dbf4775
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 0.9993

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://gimoguvi.ru/award?keyword=chromatography+method+pdf PDF link annotation
    • http://wusumomijo.medianewsonline.com/xagujoxujizejasagutata.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/37049504168v42jx.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/neet_2020_answer_key_aakash.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/types_of_freshwater_ecosystem.pdfIn PDF document text
    • https://rusudunan.weebly.com/uploads/1/3/2/6/132681855/fa0c267026a99.pdfIn PDF document text
    • http://english-10.site/wokefujipibuwez17hnz.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/how_to_read_a_metric_architectural_scale_ruler.pdfIn PDF document text
    • https://wasitenatibasi.weebly.com/uploads/1/3/4/8/134890771/c3bfa36.pdfIn PDF document text
    • http://fitokapss.xyz/76450786475rtied.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/mamuzagiguvorufopafojuji.pdfIn PDF document text
    • http://skout.tech/new_latest_ringtone_punjabi_2019_downloadm2mi8.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/chicco_baby_azzurro_nextfit_zip_air_convertible_car_seat.pdfIn PDF document text
    • http://ropisunofo.mygamesonline.org/bivodasiwem.pdfIn PDF document text
    • https://nikonewakudofu.weebly.com/uploads/1/3/2/3/132303001/1ef8fa7498.pdfIn PDF document text
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/b1ea06a5ed.pdfIn PDF document text
    • http://air-calm2.club/gao_veobecn_a_anorganick_chmiamhtxp.pdfIn PDF document text
    • https://gepemizuwawufak.weebly.com/uploads/1/3/4/3/134335313/mugizo.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/aswc-1_steering_wheel_control_installation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_eeb780b545054eeb92889eacadafef82.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_fb5eb52a8d9646f4a1d1db42c9e8ea32.pdf?index=trueIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_d293d9f3f9b2418b8bc21e93115e16bf.pdf?index=trueIn PDF document text
    • http://ketabigumowun.atwebpages.com/m-audio_keystation_88_mk3_manual.pdfIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_3ee2f59fac854271a5555387bfc13bbe.pdf?index=trueIn PDF document text
    • http://gixarewujedel.atwebpages.com/2002_ford_explorer_xlt_transmission_dipstick_location.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_08ff6e240e64498e800d80024f83cf30.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_off0000faba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 5252 bytes
SHA-256: 001d7306e962884f214a529ce0a3923ce72bf9501df98da7d84b335a6c870061
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 11344 bytes
SHA-256: bbae393476e971818c75ecd5c199bc4250110191754bf998f87204948a32522e