Malicious PDF — malware analysis report

Static analysis result for SHA-256 135c560940b1dbba…

MALICIOUS

PDF

81.6 KB Created: 2021-03-16 03:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 391e11636da810d77214de6057910c2b SHA-1: c4bd4916fecb078cbc22695097a72d2e8e222ca5 SHA-256: 135c560940b1dbbacb12393d8f93c59a41562092c255c929ae8f3ceeaa2ef78f
196 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which appear to be part of an SEO link farm designed to redirect users to malicious content. The primary malicious URL identified is https://maypoin.ru/strik?utm_term=how+to+prepare+a+job+interview+in+english+pdf, which is likely used for phishing or malware distribution. The document's structure and the presence of multiple external links strongly suggest a phishing or social engineering attack.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/strik?utm_term=how+to+prepare+a+job+interview+in+english+pdf PDF link annotation
    • http://gexopidikimo.mygamesonline.org/88154618150.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/can_i_use_a_bluetooth_keyboard_with_my_samsung_galaxy_tab_10.1.pdfIn PDF document text
    • http://bekokax.getenjoyment.net/pufufebegujuvu.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/xadaje.pdfIn PDF document text
    • http://lakcherie.ru/sherlock_holmes_hound_of_the_baskervilles_character_analysis64ukt.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/wagner_power_steamer_715_manual92k71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/23328501886.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/what_can_you_do_with_a_molecular_biology_degree.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/juluwijubulusaxabibov.pdfIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_1c86e080200e4b44a8c7c1af3f56352a.pdf?index=trueIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_c6bf0e469244494d8cdb6918fcf4745c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lebaxa/tosowijujabejutagurirife.pdfIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_df1d9d18a235430292bf4d15083c779b.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_50ed80f6b20248e1aea090b10753f8ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/risisipajole/brooklinen_or_parachute_sheets.pdfIn PDF document text
    • https://31e4cf53-1011-4add-8010-1ee96a99a80b.filesusr.com/ugd/6846fe_a78be3fb6b7a4b76bf3c38b504b375d4.pdf?index=trueIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_ed1a47af66d941c591d2588cf0f08dac.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_0b9d23d04f0a4093a0f29085503c9515.pdf?index=trueIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_09b613c6a83046f288544d22cb7df8ff.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_0e966ca36d154f3781a9e6d2408842b6.pdf?index=trueIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_1615d9c9f56642ad933000e693fe95ca.pdf?index=trueIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_eaaca7bf242f45b289888f440aea41f4.pdf?index=trueIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_e042e7175c604b5999604aaf7e901cae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/falcon_lake_fishing_guides.pdfIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_132eacbe6eb54a5383af208cdecbfb9f.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_off000100b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B5 5632 bytes
SHA-256: 336d24452b4768f1134494e25ad53e4ac594f45e28f52fc96887190cf397441e
font_01_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 10796 bytes
SHA-256: 37f671803074e95ed8248e90829381dcba72e83af1f749978ed399dd4061a6aa