Malicious PDF — malware analysis report

Static analysis result for SHA-256 3201c658eef4d73e…

MALICIOUS

PDF

77.9 KB Created: 2021-03-19 23:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6ffc3988eb6da27ba473439ed3229b3 SHA-1: 2a22022269e4669a13f5aaecf97411421d71c1ce SHA-256: 3201c658eef4d73e5401e36868a99e6d67a0433329898ada7a2c4782d8d7c204
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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-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://golowaki.ru/123?utm_term=adding+and+subtracting+worksheets+for+grade+2
    • https://cdn.sqhk.co/dikapagoloza/h06ciiE/fedunevewuvepedekijibag.pdf
    • https://cdn.sqhk.co/tosijoxopum/jhhlHjb/52104442181.pdf
    • https://cdn.sqhk.co/gulizate/A6idieR/vijagut.pdf
    • https://cdn.sqhk.co/nezazexador/mgjhhi5/war_of_the_worlds_movie_online_free_watch.pdf
    • http://pugorot.mygamesonline.org/2018_jeep_grand_cherokee_service_intervals.pdf
    • https://cdn.sqhk.co/texivewa/pRniagf/rasoromikeda.pdf
    • https://cdn.sqhk.co/namulofilox/9iepvoe/comcast_customer_service_number.pdf
    • https://cdn.sqhk.co/zoburawava/cigjdjc/zombie_war_and_shooting_games_online.pdf
    • https://cdn.sqhk.co/zamupefa/thaidif/turbo_league_hack_mod_apk_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lugifer.onlinewebshop.net/black_eyed_susans_book.pdf
    • https://s3.amazonaws.com/supefujoxopubu/dsc_impassa_installation.pdf
    • https://uploads.strikinglycdn.com/files/f57bd712-058e-4c67-a87f-9b4c73b94051/tascam_dp_24_review.pdf
    • https://s3.amazonaws.com/sirilagewuga/57460148245.pdf
    • http://bavotuvezomevi.myartsonline.com/c_programming_language_basics_tutorial_for_beginners.pdf
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_70fdfdc81b414f28a424262e83c99b4d.pdf?index=true
    • http://ritumogadoj.onlinewebshop.net/evenflo_nurture_car_seat_strap_adjustment.pdf
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_09b33890b58244e0ace798d82db6a203.pdf?index=true
    • https://uploads.strikinglycdn.com/files/224abee0-4987-43cf-ab07-f0b1a96498e4/temuvenebudilu.pdf
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_d4b94a4d5e784c91954eb472244a04d3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c70aaf9-5a27-483b-86bd-ef3d1b30c630/streetcar_named_desire_short_plot_summary.pdf
    • https://97ca8ee5-9e40-45cc-bd46-7bc1f23d59ff.filesusr.com/ugd/112b0f_8064b38253b8453a970a617159c0212e.pdf?index=true
    • https://s3.amazonaws.com/legipalofi/1964310555.pdf
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_cfb9fcf8ddcd4597aab3fa37e2e3315b.pdf?index=true
    • 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_off0000efbd.bin
081782b1b3e2aea731ee064a76517f21904337266371f4f14adcf8f4dfaaafa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 5668 bytes
font_01_sfnt_off00010317.bin
65ff5f14aedf8d09d3b5b472aae4858f1b98b58268e3f0adc09ac80291ef5219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 11288 bytes

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