Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68afb6137c6b885…

MALICIOUS

PDF

74.4 KB Created: 2021-03-10 10:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 84320389a4e31c7dac8bdf057fec095f SHA-1: 5d0fcb6dbfa16e62058ae3cbdfcb7481101f8682 SHA-256: a68afb6137c6b885cd1b5c70a087bab319141e7950d5483d9ce7843a7d436331
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 0.9991

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://baarspo.ru/award?keyword=barron+s+toeic+8th+edition+pdf+free PDF link annotation
    • http://ketaton.mywebcommunity.org/41015543312.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/gavizogeremib-zafafuwolivuges-zubebojodumur-sibipivojajux.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/74529004895.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/bc7cab1cded49.pdfIn PDF document text
    • https://ziduxaxeg.weebly.com/uploads/1/3/1/3/131380546/7386945.pdfIn PDF document text
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/waxivatadanefed.pdfIn PDF document text
    • https://fukorolavo.weebly.com/uploads/1/3/4/6/134639224/6929770.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/wezabegol.pdfIn PDF document text
    • http://wijutomotagam.mypressonline.com/lumakerinogafixa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/77753386-6c1d-458b-936f-863b521286a9/honeywell_electronic_air_cleaner_clicking_noise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc1f9bf-231e-4aad-b0f2-34e9025e6b34/what_is_the_purpose_of_body_rituals_of_the_nacirema.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/amazfit_bip_lite_manuale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba24a8b-b747-4a66-a01c-09b8b8ddf303/88459948619.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/bulutetupumifomepuju.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/gypsy_moth_life_cycle_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8455e0df-83b5-4a03-b5b5-57f02681d308/epson_artisan_835_cannot_recognize_the_following_ink_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/37695827741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da1010b-01c9-4fa0-9cd6-c0549ca6d10c/taxusapiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0131ec4-3442-4bf7-9b5c-89de8bce0cf2/27643638035.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/6781485582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b907b71f-02e5-46f3-9a9e-15236d1ff134/wetoxajerexatipuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77edacfc-a9eb-4e05-b142-7a901c534347/16027211044.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/marlin_336_35_remington_serial_number_location.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38F 5452 bytes
SHA-256: 6c9ef3d7a5c823ad1f11eae9b3686d65a06361ea40a0cde5d363a8540e2c7816
font_01_sfnt_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 7148 bytes
SHA-256: 8ce1f4f00f903a465c79df9a255e9bf8ec1f91cfe63f6c844f82c1077286bb17
font_02_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 9972 bytes
SHA-256: f8299b05f89cfb6e250f10a23e3d4a5e33dff72f98636bc4e84a023973e69a70