Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cdda6ca53ebd3f…

MALICIOUS

PDF

82.9 KB Created: 2021-04-26 20:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 964fcd5fe8d5f243ed0bb88278dfcc1c SHA-1: 0c4c216e8d6decf2320ca8933e35b6d2d7cd04aa SHA-256: c6cdda6ca53ebd3f4bed534c821e8fe8be076afa00e3fc7cc2adf8a9353bf880
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 S3 buckets and other domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a mass external PDF link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious URLs, potentially for phishing or malware distribution.

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
  • 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.
  • 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://dugedepap.ru/strik?utm_term=rainbow+e+series+filter PDF link annotation
    • http://sudakomazagupa.22web.org/84437430652.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/tegesufikonesa.pdfIn PDF document text
    • https://rexanofodifedow.weebly.com/uploads/1/3/1/3/131378899/4511754.pdfIn PDF document text
    • https://buwuwewofopalun.weebly.com/uploads/1/3/4/0/134097592/1b25f682.pdfIn PDF document text
    • https://jegupifak.weebly.com/uploads/1/3/4/0/134018348/772b30.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/tutapaxi/is_it_better_to_run_longer_at_a_slower_pace.pdfIn PDF document text
    • http://dajidagetulawu.epizy.com/ntse_stage_1_2019_answer_key_aakash.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/customer_ageing_report_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/texorijuri.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/checkpoint_charlie_museum_audio_guide.pdfIn PDF document text
    • http://pujeriv.rf.gd/can_i_get_hbo_max_through_apple_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/nuvusapurobilapakejoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/giluluxixofolewuwukawu.pdfIn PDF document text
    • http://monufaro.epizy.com/bhutto_dj_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/94172075832.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/93700826333.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/bihar_district_map_free.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/dell_venue_8_pro_battery_drain.pdfIn PDF document text
    • http://tifatorebuvu.epizy.com/bromelias_de_colombia.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/andres_segovia.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 5000 bytes
SHA-256: 8be9697a78e0307225062b5d3153bc0ee463d7aa9088046f01490e33d0de07be
font_01_sfnt_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 11660 bytes
SHA-256: fdb159cdea1278d6c2e9a010b180a25f2383007e9dbaa1c75d63baeb81e6b41b
font_02_sfnt_off00012727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 16792 bytes
SHA-256: cd5b7070ac469e89d8f74f41927a868cb3bb56b2b2d5140b7bc461efc54ffcf9

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