Malicious PDF — malware analysis report

Static analysis result for SHA-256 723b354462b3e7e2…

MALICIOUS

PDF

83.2 KB Created: 2021-04-14 03:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c0f496dada4068cf8073b5469d14e6d3 SHA-1: 174bfade06db081973b47700c7806e85b24a33de SHA-256: 723b354462b3e7e2e1c74f32181f16f925880987b3bd7b4284469a803bb77b4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

Heuristics 5

  • 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 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://crophysi.ru/strik?utm_term=how+to+make+a+time+capsule+container PDF link annotation
    • http://gipovasota.sportsontheweb.net/2222798750.pdfIn PDF document text
    • http://hurleyshamburgers.com/1750008819952c5i.pdfIn PDF document text
    • http://islandlandscapesbb.com/inpixio_photo_maximizer_pro_free_downloadohk83.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/articles_of_confederation_1643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5fdc09d75e797.pdfIn PDF document text
    • http://dkblogin-de.best/cat_jumping_off_building_saily1wj5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_60303a4073c72.pdfIn PDF document text
    • http://micrometerdigital.xyz/jadodifarotijemixin0rlh.pdfIn PDF document text
    • http://zesamoa.online/mushoku_tensei_wikia_eriswx0v2.pdfIn PDF document text
    • http://bunnygummy.ru/what_time_does_walmart_photo_center_openghg6k.pdfIn PDF document text
    • http://omoikiri.info/how_much_do_infants_sleep_per_dayro78r.pdfIn PDF document text
    • http://reassurez-moi-fr.info/kenmore_elite_french_door_refrigerator_ice_maker_not_workinguscnr.pdfIn PDF document text
    • http://catsism.com/how_to_do_premarital_counselingkerne.pdfIn PDF document text
    • http://teren.fun/plato_apology_analysis8odqi.pdfIn PDF document text
    • http://trokot-tonirovka.online/46799058625nli2c.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/beechcraft_1900d_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476135/normal_605f5da653882.pdfIn PDF document text
    • http://kompledom.com/why_are_jumping_spiders_cutela53v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zipemoluligera.myartsonline.com/bixumevotig.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/40470559782.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_a1968567b2754d00996bf1c58625267c.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_f8012930d4e04accb04447be3362b0cd.pdf?index=trueIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_22dc7bcea20f4f58a28e4984ef956cf9.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_10380110e1dd426fab0ed3c1a2b46cf0.pdf?index=trueIn PDF document text
    • https://2225f16e-b6a0-48e2-a067-d7e802b71dd4.filesusr.com/ugd/a7ada4_6e10761fecb94c9493670a355691fba1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 5080 bytes
SHA-256: 5eea4f97cd9a6638550738dfe212ba6c378bcfc1ac23171e0d2ad68a8021cfdd
font_01_sfnt_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 10616 bytes
SHA-256: 7626dc08e7a05b2d9201f09165509350ab6f14f0779357e1eca359963d9bbd09
font_02_sfnt_off0001311d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1311D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3