Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfe7cb9ace071ae…

MALICIOUS

PDF

78.2 KB Created: 2021-03-10 08:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ec1581f03feb7033922737f6db23fb9 SHA-1: d8361f5fa5c71bc574b7028896565d1e118b3488 SHA-256: ecfe7cb9ace071ae2cfcc8425334194d18eb958647d0349a88f92ef46be61a24
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to potentially malicious websites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The embedded URLs and the heuristic firings point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=dcfs+physical+form+illinois
    • https://cdn.sqhk.co/puvubuzu/hfxijgd/crossword_clue_summary_8_letters.pdf
    • http://goods-amzon.com/wotojogomukumucu3xp.pdf
    • http://instapriz.online/what_kind_of_charger_does_a_galaxy_s9_takeq19ue.pdf
    • https://texotawumixiwaw.weebly.com/uploads/1/3/4/8/134898612/nifexeveviwa-difupevo-xejuvorevasufa-tivoxivobo.pdf
    • https://cdn.sqhk.co/pategazikiw/hdbXja4/twisted_x_womens_boots_au.pdf
    • http://sq11mini.com/broken_angel_song_full_english_versionlbe9k.pdf
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/169f462.pdf
    • http://vazutiz.iblogger.org/what_transmission_does_husqvarna_use.pdf
    • http://opensalon.xyz/what_is_the_best_song_in_just_dance_2020p3xcw.pdf
    • https://cdn.sqhk.co/zogobadakedu/ChhRhjq/vejagogebojibomujoxag.pdf
    • http://premial.su/1959313908458a99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/solonebosop/63299933939.pdf
    • http://pefogitoveni.epizy.com/free_font_gotham.pdf
    • https://s3.amazonaws.com/mipizaju/today_sydney_weather_report.pdf
    • https://s3.amazonaws.com/pusolefosex/acog_pap_smear_guidelines.pdf
    • https://s3.amazonaws.com/gurowozenupifi/85834963818.pdf
    • https://s3.amazonaws.com/kaxukok/hotstar_app_for_pc_10.pdf
    • https://s3.amazonaws.com/zolerazowubow/html5_syntax_cheat_sheet.pdf
    • https://s3.amazonaws.com/fidefofudi/bed_sheet_and_duvet_sizes.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_off0000f687.bin
dfcb8bb81fb764c2627588f1aff429b2a6cb3e55cebfcf49f2c9b86ce32fff75
pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 5356 bytes
font_01_sfnt_off000108a7.bin
49f14f3e4a03ff3b622480797c8967e275bb36236f3f3a6a65ffa92f56425c54
pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 10360 bytes