Malicious PDF — malware analysis report

Static analysis result for SHA-256 a75f219e809cfea6…

MALICIOUS

PDF

70.8 KB Created: 2021-03-16 18:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7f8376e547384f089d50524e096d175b SHA-1: 854f17ecd3c26fa8a45652cb9979a4726997ad92 SHA-256: a75f219e809cfea6aac4e14c80eafc91e629eb0d612be209b08fe2848593e710
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to formal dress hire, likely serving as a lure to direct users to malicious URLs.

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://jumiwimov.ru/123?utm_term=formal+dress+hire+sydney+cbd PDF link annotation
    • http://study-english-04.space/pre_marriage_counselling_questions_christian1njc6.pdfIn PDF document text
    • http://zumarez.22web.org/cambridge_audio_azur_640a_amplifier_manual.pdfIn PDF document text
    • http://boost-store.net/gixaxorulonuwigodo826jv.pdfIn PDF document text
    • http://republvinb.fun/what_are_the_characteristics_of_anemiam34jf.pdfIn PDF document text
    • http://sutufobu.iblogger.org/72858514402.pdfIn PDF document text
    • http://rapegutuxipik.22web.org/putnam_investments_ira_beneficiary_distribution_form.pdfIn PDF document text
    • http://zokixofevuku.22web.org/kasikonixodu.pdfIn PDF document text
    • http://mimedilubaj.22web.org/contract_costing_format.pdfIn PDF document text
    • http://lolafoduluj.22web.org/i_have_already_informed_meaning_in_tamil.pdfIn PDF document text
    • http://rakajipof.22web.org/bypass_proxy_android_mobile.pdfIn PDF document text
    • http://parkingtest.xyz/best_english_learning_app_for_pcnwf6h.pdfIn PDF document text
    • http://palejep.22web.org/68544813013.pdfIn PDF document text
    • http://joblanc.xyz/96605751583ndned.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_4ac2ad4cf9b64442a9dd0079ea39df18.pdf?index=trueIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_9d5adb2d049d407aa4865d10f3f8f145.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_85e2470c62b04c33882c97b2ddb30c6e.pdf?index=trueIn PDF document text
    • http://noluboxemefosa.epizy.com/18611420641.pdfIn PDF document text
    • http://laganomezavarof.epizy.com/nurokakiwijavubulofotonev.pdfIn PDF document text
    • https://cf62593c-3f62-494e-9ef9-3c2a63ead7d7.filesusr.com/ugd/93dae2_184b949993d54c04b2070e5fd2defa90.pdf?index=trueIn PDF document text
    • http://zofikexegugimum.rf.gd/80450978652.pdfIn PDF document text
    • http://pekarenov.rf.gd/calligraphy_fonts_guide.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_e03fc18d3d274f71bdf383371c650fed.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_5ed6d802203541f0a25dc9580d09df27.pdf?index=trueIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_efc69496286540dc995e852a3731fd4f.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_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 5376 bytes
SHA-256: e45eaf44936e52608c31f4da01b5004c28e71f1387d2ac4342749c07312e13e0
font_01_sfnt_off0000e82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82C 10860 bytes
SHA-256: ac8c85481f26426d49f86cc86394922ac8df07b104923469ce8ff42d125e773f