Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3615a3e3bc817d…

MALICIOUS

PDF

74.3 KB Created: 2021-03-24 12:05:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7e5bc888bfa23d8dc0db0d7b679e9deb SHA-1: 262331497617e53344bb5d8f65d3103c863e00af SHA-256: 2a3615a3e3bc817d5927c93c62a35885a869a0fcf06dd37efe3dc2528ac081cd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links to various domains, many of which appear to be disposable or used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or distributing further malware. The primary attack pattern observed is the creation of a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/wix?keyword=guide+gear+denim+jacket PDF link annotation
    • https://viwekaxirudadax.weebly.com/uploads/1/3/4/7/134700275/feaadfc04.pdfIn PDF document text
    • https://kaxaratit.weebly.com/uploads/1/3/5/3/135383379/2065513.pdfIn PDF document text
    • http://muslims.net/android_version_8.1.0_api_levelrmw1a.pdfIn PDF document text
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/a7a49bb6d6c.pdfIn PDF document text
    • http://finutepanaj.iblogger.org/master_clean_antivirus_app_free.pdfIn PDF document text
    • https://zufonarupidib.weebly.com/uploads/1/3/4/7/134721949/budifasosepafi_sofugapekul_ganejiveraxego_ropuwujaxul.pdfIn PDF document text
    • http://useplafond.xyz/simewidokegijagihsvyu.pdfIn PDF document text
    • http://1-bog.ru/how_to_trade_bitcoin_on_cash_appwhdyi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c84b8c5-d9f1-4451-9b64-fd513af04fdf/98808722337.pdfIn PDF document text
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_6b8c147f8aa54d97af04f395a8cf2378.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c93b7f-4f0b-4ee4-9eab-6decd7ac4409/pafepofuvutamofi.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/gerund_infinitive_exercises_with_answers.pdfIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_b566cbb31ff24ae185a0d70a38316e98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54065458-6aef-428a-b3b5-685b354d9347/tipping_point_state_odds.pdfIn PDF document text
    • http://maturar.rf.gd/vobusavolapemasanubezaku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8ddea8-db61-403f-8a05-7fca0e222d44/how_much_does_a_big_round_bale_of_hay_weigh.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/dusabupuxotigika.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_d5cd95c298cf44adb0924332e064a4bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luxelula/kibaxofediwumexosekuxodud.pdfIn PDF document text
    • http://wimoduwogukuruk.rf.gd/the_woman_in_the_window_trailer_reaction.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_15a08de127e54cf69b94999ddebc4242.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/sony_sa_w2500_manual.pdfIn PDF document text
    • http://foxebunuref.epizy.com/beyond_light_years_sub_indo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 5220 bytes
SHA-256: 1c884f4376d899d10ceea8e685b0906050e85de20e5e0df9a2a52addd2b804e5
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 11216 bytes
SHA-256: 8a8d9b633813fe34a8cad10bbf3ae92e24b06b6d0e47aa2be520a3ac5391f722