Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a98c535d3f20d2…

MALICIOUS

PDF

73.7 KB Created: 2021-05-23 17:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea338adf53670bec4419b41cd47641d6 SHA-1: 547d1a7996e16ef0f7334739a0676c3286cf7265 SHA-256: 91a98c535d3f20d22ca2cdd6a8eed49a7908c26a8cec1a6e27debd4ec5a37789
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, directing users to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=teddy+bear+baby+shower+invitation+template+free
    • https://wigotimobegevuj.weebly.com/uploads/1/3/4/3/134312632/novegubupekemerut.pdf
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/926977.pdf
    • https://budorezaru.weebly.com/uploads/1/3/4/8/134859022/vubomoj-jefitot-bebajugefezusan-lotuxi.pdf
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/ba42d9a.pdf
    • https://xudisuwovoj.weebly.com/uploads/1/3/5/4/135400752/abd3a5de0.pdf
    • https://tupirusu.weebly.com/uploads/1/3/4/7/134702138/3123360.pdf
    • https://vukezozonobobex.weebly.com/uploads/1/3/1/3/131383599/xunes_wabitetifamot_zexofejeziga_kegaxaderisejo.pdf
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/7618611.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/35bb5fdf-d8d2-4501-86cc-0d515c9918a2/how_to_say_weather_the_storm.pdf
    • https://uploads.strikinglycdn.com/files/18364203-703d-4ab1-95ec-d1b2e9a6e6ee/88888284502.pdf
    • https://s3.amazonaws.com/kosipefojaw/dozijirapuwinowa.pdf
    • https://uploads.strikinglycdn.com/files/26c8b2af-c31e-4d92-9233-5a10923caaec/34905692017.pdf
    • https://s3.amazonaws.com/jidosatikim/regreso_al_amor_marianne_williamson.pdf
    • https://uploads.strikinglycdn.com/files/6a411902-d848-4bc7-afd5-61f3c32b55ef/volume_of_a_rectangular_prism_worksheet_answer_key.pdf
    • https://s3.amazonaws.com/xozeb/84223584889.pdf
    • https://s3.amazonaws.com/wifukedot/garmin_echomap_uhd_94sv_fish_finder_chartplotter_combo.pdf
    • https://uploads.strikinglycdn.com/files/d022ce71-57ed-427d-bcf3-41744840bb3b/which_salt_is_more_soluble_in_acid_than_water.pdf
    • https://uploads.strikinglycdn.com/files/bb17dc32-4877-4973-84b1-402dac2f625c/cookie_monster_valentine_cards.pdf
    • https://uploads.strikinglycdn.com/files/98c21535-fa2e-4424-9f1a-2718a942d364/how_to_do_technical_analysis_forex.pdf
    • https://uploads.strikinglycdn.com/files/02f1f918-befa-4d22-83e9-3108a8fc302c/conversational_english_topics.pdf
    • https://uploads.strikinglycdn.com/files/d198d34b-6ef6-4b94-9bcb-5f25a0daeac0/jepetiwadiw.pdf
    • https://s3.amazonaws.com/batoragubukepo/51482139186.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_off0000e369.bin
656ca3b0143408ea81e8962664cb9a67c6544bff72623d6304c0cb11d6f543fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 5624 bytes
font_01_sfnt_off0000f677.bin
4b24d494dac9de8d1fe4396a57613828a3f39cd328db57527cb80e2e58311ba0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 10168 bytes