Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b851392a0344c7…

MALICIOUS

PDF

74.1 KB Created: 2021-04-23 15:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1135fe4b1020735476d380385284643 SHA-1: d5617b5c6567fd9d307ecd02e7a690bb39d61163 SHA-256: 80b851392a0344c7dfb5d4469c3cd99ee64f169f44b784a32bc046329c8a9192
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded links, such as 'https://seumenha.ru/strik?utm_term=how+to+set+howard+miller+grandfather+clock', suggest a lure to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=how+to+set+howard+miller+grandfather+clock
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/97e24be.pdf
    • https://cdn.sqhk.co/bejomewuv/hahgigm/nfl_schedule_week_5_espn.pdf
    • https://cdn.sqhk.co/muditazu/YAc2lif/25792998269.pdf
    • http://firstdoctor.xyz/61526318652xcrmi.pdf
    • https://cdn.sqhk.co/fafojipedul/2gdhdig/cdc_flu_vaccine_sheet_2018.pdf
    • https://cdn.sqhk.co/modonasuje/Mjedje4/angry_birds_2_gameplay_online.pdf
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/kugeronazemidazu.pdf
    • https://gegizadewer.weebly.com/uploads/1/3/1/4/131482997/a42ff33e61c850.pdf
    • http://xtina.online/what_are_the_ingredients_in_cauliflower_pizza_crustzbdm1.pdf
    • https://gukusuwinadeg.weebly.com/uploads/1/3/4/8/134880507/3202514.pdf
    • http://vinnipoh.space/forex_broker_killer_free_download1wfvq.pdf
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdf
    • https://cdn.sqhk.co/wazotifuk/gYT5dQT/tokaido_shinkansen_seat_map.pdf
    • https://zunovuxosuseso.weebly.com/uploads/1/3/4/4/134497136/pojedilezaru.pdf
    • http://form-lnstagramcopyrightservices.com/by_the_seat_of_my_pants_definition8ad5a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_7992702fc97c443a93e5bea8d1c1d698.pdf?index=true
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_982d4c9564094feb9fbc944547b7415d.pdf?index=true
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_d2eb9b3ad72543de8dafd29e402eafc4.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_dcec6131d7214ca680fddcdf1c11121f.pdf?index=true
    • https://c79dcb07-c1b1-4d84-a600-6417d8bf0f54.filesusr.com/ugd/edce22_7d37ff828ef240e9b401a1352e9c8c33.pdf?index=true
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_182410465ffe4c66880b2aa39f4307a1.pdf?index=true
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_ece367dd2b854b738f289bbbc73c67e5.pdf?index=true
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_5ed2058752d548bab315154d2171199b.pdf?index=true
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_c4f684c626d144c69b598a8916811060.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e8.bin
c9389fab8e947a7987ad9e4ca9010a1a1cda6eb19287f7a2759ef609ffd04b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 5552 bytes
font_01_sfnt_off0000f4b4.bin
a06354df734279783dece090c74e24e2d7e6d7547b1bfd6bb597ee89ef0e4010		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 11172 bytes

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