Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2d73ce82504882…

MALICIOUS

PDF

79.7 KB Created: 2021-05-21 07:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 823b559c413a4bd55e94867631c13477 SHA-1: 20d00350ce312c65f3d1192430ceee09adf9bad8 SHA-256: ab2d73ce82504882a5a4d9024bba5eeb1d8d8f25391060f1266fc81a5aac1266
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as part of a link farm designed to redirect users. The primary redirector URL, 'https://baarspo.ru/strik?utm_term=florida+general+affidavit+form+pdf', is used to lure victims with a deceptive filename. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', indicating a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=florida+general+affidavit+form+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471092/normal_6060f1c645643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_603b1f63a4b85.pdfIn PDF document text
    • https://pijuvadugodawa.weebly.com/uploads/1/3/4/3/134307721/511d950923770de.pdfIn PDF document text
    • https://nakusiwikabudu.weebly.com/uploads/1/3/4/9/134904560/lobuvojasorugupogugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_5fd21714496a3.pdfIn PDF document text
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/velawigekekefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_602496bb48f92.pdfIn PDF document text
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/xevabaruximuja.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/kudowo/motatukozafijiwewona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35e3899-fbd5-4bf0-99ac-a7757fd27dcf/kugepirufet.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/autocad_2014_crack_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc25bf2-9b50-49fd-a838-eca4f6837d5f/which_g_shock_watch_is_the_best.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1869f653-ace8-4b0f-97e2-f7f525bfbe4f/how_was_jesus_life_as_a_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ed102d7-19be-46d7-a651-ae7786d3e78e/wemifufulipapadez.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/keokuk_county_iowa_sheriff_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/solexoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa475c3d-9dd4-4cb1-a1eb-8911cdea72c1/table_of_plenty_rice_cakes.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/telegram_sticker_maker_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702e5fd6-a414-4222-a54a-fb605f9e6489/imac_user_manual_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/2010_bob_revolution_duallie_car_seat_adapter.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/41491825041.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/95594306347.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/wisconsin_warranty_deed_form_1.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_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 5196 bytes
SHA-256: aaad9c8e373a652141e49b925afba69d80ca50f2b8f4010121e33fd971b019bc
font_01_sfnt_off00010c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 10664 bytes
SHA-256: 24162cd4da00b5b59325bf386938806c78fc38b29a77aa96747e450c3a24e4aa