Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c4f671fdc02ebf…

MALICIOUS

PDF

75.1 KB Created: 2021-03-18 04:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57a051f6b6646647bbec10c1e0d611fc SHA-1: dbabef325319beefc7e8d9542c890ffa4037a560 SHA-256: 38c4f671fdc02ebfe9e636c22273e83088e1a37088ee1c5737dc9ee7630dff34
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of a large number of external links, disguised with search-engine-optimized keywords, suggests a phishing or content-luring campaign. ClamAV also detected it as Pdf.Phishing.Trojan.

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-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://botokaw.ru/123?utm_term=spider+man+2017+new+game+apk.+com
    • http://kzrovk.xyz/traffic_road_game_onlinejkpum.pdf
    • http://sevezor.scienceontheweb.net/how_to_send_score_reports_gre.pdf
    • http://nizavevorupuj.mywebcommunity.org/828675115.pdf
    • http://larokamexi.sportsontheweb.net/59269606060.pdf
    • https://cdn.sqhk.co/xarobumevux/rpHifhf/jofarepadetaxabiwiworuwi.pdf
    • http://ejqy.com/how_to_get_rid_of_a_pimple_on_your_nose_piercingxvy1u.pdf
    • http://oblakova.ru/how_do_i_update_my_tivo_bolt_softwares4r6a.pdf
    • https://cdn.sqhk.co/lejukujegomi/SBSqJfm/lewupobevagujebixixudaje.pdf
    • http://tk-time.site/26128217091t25tt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0e610bf7-9179-411f-a273-8b0b9275cec8/52455038106.pdf
    • https://s3.amazonaws.com/magapeguwabe/50473234156.pdf
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_34cf7549a62148038a2a96237d2edaae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d0920154-c139-4c9d-abff-937b64611f81/wakiregorogemerokode.pdf
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_09b167bb12b74f11bffa2dc04a654f4f.pdf?index=true
    • https://s3.amazonaws.com/bulujono/dotowirisozunaworotet.pdf
    • https://uploads.strikinglycdn.com/files/64c1edf8-6e09-4a9a-8a84-e8e61f4d5b5c/ingredients_in_wendys_spicy_chicken_nuggets.pdf
    • https://uploads.strikinglycdn.com/files/07be36e5-bc20-4eb2-8add-f59a624f146c/are_lever_guns_reliable.pdf
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_6b795a0a3f65477595d92768afab3cf4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1e5c854d-0400-4c2c-9855-b6b39c9a09b8/78818203101.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_off0000e35c.bin
e5beeccbe60f9dbb89f6da1b53aa0bc8b7c3a705fcfd3493cd73e2670e8b3379		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 5880 bytes
font_01_sfnt_off0000f776.bin
681b6e756bfcc3c9cf55c4c15f2936ac107782e0b1123f6896aaf29217874ec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 11244 bytes

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