Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c3ca0c67895539…

MALICIOUS

PDF

74.2 KB Created: 2021-04-12 01:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9dc0a6b0ff796334cafa47e405262831 SHA-1: cd092e65da6a60ce87008ce12d6642a19a8f1482 SHA-256: c3c3ca0c6789553902cb2c6623edf6c8610245d70062351f424aea7d91c66eae
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to disposable domains, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'how to make a bench out of pallets'. The presence of embedded URLs and the ML classifier's high confidence score indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+make+a+bench+out+of+pallets In PDF document text
    • http://energytik.net/oxgord_ms300_how_to_usecc704.pdfIn PDF document text
    • http://zisetevopazotaw.iblogger.org/fixifamevolemuxumoseruga.pdfIn PDF document text
    • http://bewelaxoludiw.22web.org/cardiopatia_chagasica_fisiopatologia.pdfIn PDF document text
    • http://indonesia2health.online/minecraft_1.8_full_indir_portalcyzb293c.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/rizorebomos.pdfIn PDF document text
    • http://vusikudezewoteg.iblogger.org/antonyms_examples_100.pdfIn PDF document text
    • http://mewibapevuwado.22web.org/90995975967.pdfIn PDF document text
    • http://fufejezonodim.mywebcommunity.org/mifefadurolebagigawopuk.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/android_studio_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/jeep_bed_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/19901925196.pdfIn PDF document text
    • http://josusasufuni.epizy.com/jisoxawebapulunufadukejoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8b86d0-8c62-4dbc-85e4-3885517af0e0/47815240386.pdfIn PDF document text
    • http://reduxaxu.epizy.com/10845828104.pdfIn PDF document text
    • http://wekijedi.epizy.com/nofisodogalokijuxedev.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/87047915162.pdfIn PDF document text
    • http://molomafifivis.epizy.com/penafisoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6207e81b-b653-45ee-b23b-3cad8bcb47bd/how_to_hide_images_in_iphone_6s.pdfIn PDF document text
    • http://besasasef.rf.gd/tencent_gaming_buddy_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/how_much_do_health_and_safety_managers_make.pdfIn PDF document text
    • http://xaraberedi.rf.gd/carowinds_park_map_2020.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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 5416 bytes
SHA-256: a0a862a9c0946abcf1529a23d601f8c471d83405900fcfdd8fd5df4de011a8fd
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 10996 bytes
SHA-256: d4ebb1fcba5097e94e32ddd2eec768784513035d06adf1cc2d5b6a341fa86487

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