Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf52c180eddf66f…

MALICIOUS

PDF

79.5 KB Created: 2021-03-04 19:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebd274e034ac6e18277d497121eb48df SHA-1: 2e772b39f33d1e59ec4df6ea3b6f908b815fa3aa SHA-256: ecf52c180eddf66ff1350dc66daa9bd25c54cbf9702e72563dd7da2e703709e7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://pelibifir.ru/wix?keyword=corpse+bride+nightmare+before+christmas+fanfiction, indicates a potential lure related to popular media. The PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://pelibifir.ru/wix?keyword=corpse+bride+nightmare+before+christmas+fanfiction
    • https://gonufefimexej.weebly.com/uploads/1/3/4/8/134892828/4108629.pdf
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/topukamadilivatafu.pdf
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/pifematoje_vixixak_kigowasejekig_tomafalujuromi.pdf
    • http://xawamiwupajev.mygamesonline.org/48171634727.pdf
    • https://sujolatako.weebly.com/uploads/1/3/4/6/134624807/mejor.pdf
    • https://kezexawu.weebly.com/uploads/1/3/0/8/130814062/desipubada-bolozowigemiru.pdf
    • http://tezijexipilimo.getenjoyment.net/wuzokamomapubavu.pdf
    • https://tugovupovo.weebly.com/uploads/1/3/1/3/131380456/zuwijivakitabozij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nesazovopiw.rf.gd/where_to_watch_missing_411_movie.pdf
    • https://uploads.strikinglycdn.com/files/d5114562-c2ff-4b65-b8d6-d3781f9b9834/here_i_am_lord_lyrics_dan_schutte.pdf
    • http://gexazavere.epizy.com/microsoft_office_2016_pro_plus_activator.pdf
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_2c205b8aeb694e658284a8b71ec301e6.pdf?index=true
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_eaccb50719fc4f299ab7e742a281b8aa.pdf?index=true
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_90565f526b0b409b8660275abab24453.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e5cb72bb-076c-4441-97c7-b63b0b7ab9ae/which_phobias_are_most_common.pdf
    • http://jisijuvod.myartsonline.com/how_to_bar_a_soldier_from_reenlistment.pdf
    • http://wazuvit.rf.gd/ginakagilufi.pdf
    • http://wegugoleta.onlinewebshop.net/jovux.pdf
    • https://uploads.strikinglycdn.com/files/3c4d2e50-047b-4bf4-8fe2-9d5fcb12fa1b/when_dimple_met_rishi_synopsis.pdf
    • https://uploads.strikinglycdn.com/files/496f074f-6053-444a-87cd-42c94b1120f7/zazozotekuxoxe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f924.bin
c1c9530bdcda399375ef34a81922c70f0cd3f87f6c04c78bf0834c0571820742		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 5584 bytes
font_01_sfnt_off00010beb.bin
b3cb560a3f6a2042b54d1cac6c04c29aad6ee65fa5ad63208240723f625caee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 10780 bytes

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