Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2053bde39a2daf…

MALICIOUS

PDF

132.7 KB Created: 2021-05-26 00:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 315bca53c928f2a6032572a0b74be642 SHA-1: dc8cc63f93ceb05781f31fee8e3241728facf23c SHA-256: fa2053bde39a2dafd034dd4dd0d557350d1c2d5733005059ff920a6abca53854
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a prominent one disguised as a download for 'Warhammer 40k rulebook 7th edition pdf'. This link, `https://jumiwimov.ru/strik?utm_term=warhammer+40k+rulebook+7th+edition+pdf`, is identified as a redirector for free-download phishing. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of many such links, suggesting a campaign to generate traffic or distribute malware. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=warhammer+40k+rulebook+7th+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5fcb292a0ce35.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/44e050ad.pdfIn PDF document text
    • https://vorusasu.weebly.com/uploads/1/3/2/7/132740845/5852548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_60498ec33fc47.pdfIn PDF document text
    • https://nipibodofabujid.weebly.com/uploads/1/3/4/2/134265940/7856855.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/463c5dd380eb803.pdfIn PDF document text
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/9117070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470231/normal_605bfc473009d.pdfIn PDF document text
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/e0876.pdfIn PDF document text
    • https://moviwinexanasi.weebly.com/uploads/1/3/4/3/134314602/45850ff2d.pdfIn PDF document text
    • https://bumopisizepe.weebly.com/uploads/1/3/4/6/134606815/xemivifiziw-vaxodajoko-xilejeduxulewun.pdfIn PDF document text
    • https://jegiwagoxupida.weebly.com/uploads/1/3/1/3/131379361/juliregaze.pdfIn PDF document text
    • https://morurotefat.weebly.com/uploads/1/3/4/3/134317018/xuleda-puvobumujid.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/vibuvomomuv/dish_network_tv_guide_tonight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6d69d5-a3a5-4bcc-8d05-cf0c6647c6a2/rosedubozalomanuwojod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/695c5192-6d1b-46ec-9aad-1b37b147151f/how_do_i_reset_my_kenmore_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/bb_key2_android_9.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/chaganti_koteswarao_pravachanalu_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/sofa_cushion_foam_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/do_ikea_sell_king_size_beds_in_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/97495857145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bf9643-db9d-4a2c-a0a4-e97d28ed6df7/jack_reacher_2012_movie_download_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/java_offline_64_bit_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3996acbf-58b2-4405-9987-09c38e9a6723/what_does_wr_10_bar_mean_on_a_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7bde31a-035b-47cc-b469-c47abe7b8244/lulosigitojarobulonu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9BD 5628 bytes
SHA-256: cdc114463d64c330a5a3fae022c3d5d58ad059bede5458bf942f6c91fdbb32d3
font_01_sfnt_off0001dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCC6 11724 bytes
SHA-256: b3e8bff5246fa425b2931a09e018fc96b5700eb7b1546f994a40fa87b02cd513