Malicious PDF — malware analysis report

Static analysis result for SHA-256 13022bc01bbcf8d8…

MALICIOUS

PDF

78.7 KB Created: 2021-04-15 07:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efe496c1f0fc213cd2aeb6926f18a22b SHA-1: 7288ff6cdfa0f6682911197f3120ef590fe4ec7f SHA-256: 13022bc01bbcf8d81dcafc142fc3f356bd02759655b55ae0c6e466da8afef244
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with many pointing to suspicious domains. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document body, though truncated and obfuscated, suggests a lure related to an 'English grammar full course free', aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=english+grammar+full+course+free
    • http://kotowis.22web.org/android_snackbar_move_view_up.pdf
    • http://zomewegi.iblogger.org/ciara_ride_song_free.pdf
    • http://litagud.22web.org/nigimifola.pdf
    • https://cdn-cms.f-static.net/uploads/4443357/normal_60437cfe82664.pdf
    • https://static.s123-cdn-static.com/uploads/4501484/normal_5fe0b4d56fc17.pdf
    • https://cdn-cms.f-static.net/uploads/4446398/normal_6046d1f77a298.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/543fe961-11d1-40d5-9d96-cf9a89588c0a/symbiotic_relationships_worksheet_good_buddies.pdf
    • http://fepesori.rf.gd/widuxub.pdf
    • http://mutaloliz.epizy.com/sims_3_patch_1.69_download.pdf
    • https://uploads.strikinglycdn.com/files/4c882096-73b2-401c-a2af-0528c990b3c2/80039552666.pdf
    • https://uploads.strikinglycdn.com/files/90702d64-b8bb-4ffa-b203-45d3f5c82552/repotan.pdf
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_00bbfc34bba7492cad5cea7f588a72da.pdf?index=true
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_2678769b5b294706885a5aed5674ab74.pdf?index=true
    • https://uploads.strikinglycdn.com/files/14e7c140-5747-42a5-9e40-b4567a4b2f29/how_many_calories_in_boston_market_chicken_thigh.pdf
    • http://bezopiwuzalobit.rf.gd/dukefal.pdf
    • https://uploads.strikinglycdn.com/files/b40c9f88-7a4f-41dd-aac1-07c96c0a6e46/htc_one_m7_vs_m8_vs_m9.pdf
    • https://uploads.strikinglycdn.com/files/c884a364-4e12-4604-8b8e-a2b44db60cf9/masters_degree_in_coaching_psychology.pdf
    • http://wanuzenupikow.rf.gd/76547637608.pdf
    • http://gozotonitiki.epizy.com/xuzapenegatunevipavipaton.pdf
    • http://fepapemifen.epizy.com/wejosupixawejagilolati.pdf
    • https://uploads.strikinglycdn.com/files/79d26088-a287-4c94-a0d7-13cb92eaf380/ap_style_percent_in_headlines.pdf
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_8ce9ed132d83447bbdcad7f6c1dff916.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b9a0182f-2853-42c4-9011-61a3249f4e9e/dowatekusenajen.pdf
    • https://uploads.strikinglycdn.com/files/7460bc35-402a-46e2-bf31-f03ea50d2175/schwinn_430_elliptical_measurements.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_off0000f60a.bin
5348639bf9c03b2d018fdad44f93158325f6d24e022d83c34ad5c7af62eec1c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 5252 bytes
font_01_sfnt_off000107bf.bin
1c259b083c3ddd355fbec4c81059376e5075b1969ac33cdda497902049a1095c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 11256 bytes

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