Malicious PDF — malware analysis report

Static analysis result for SHA-256 8291ce12e4741d6f…

MALICIOUS

PDF

103.3 KB Created: 2021-03-24 04:54:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5beb71391fc3b610b1701103bda77e4d SHA-1: b90229027db6017fce3ce65cc08caa0c065dee19 SHA-256: 8291ce12e4741d6f620b0b910fcc8385faa0a5a82a775ad6d367e52fc64597a8
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning tactic. The presence of a critical heuristic for PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicates a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://midufefew.ru/award?keyword=old+man+logan+vol+1+pdf PDF link annotation
    • https://puguguduzi.weebly.com/uploads/1/3/0/7/130739618/2219369.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/c89e8a.pdfIn PDF document text
    • https://lukexurilewudon.weebly.com/uploads/1/3/4/3/134335891/993756.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/63490431816.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/nekowuvigozema.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/94930443918.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/7886891.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/548d8ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_602971a996278.pdfIn PDF document text
    • https://dutumeparozawa.weebly.com/uploads/1/3/1/1/131163590/zulanuvakuki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486997/normal_5fc952c7bc853.pdfIn PDF document text
    • https://lijipipixeralof.weebly.com/uploads/1/3/3/9/133999964/7c19251e26f007e.pdfIn PDF document text
    • http://lotibamuzuti.scienceontheweb.net/arthur_schopenhauer_biography.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tulifal.onlinewebshop.net/nusedaxokapakuramu.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/awaken_the_giant_within_english.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/cisco_switch_set_time_manually.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/speech_cue_cards_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/honda_5_wire_o2_sensor_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/labazadawagivinunu.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/mojelekobavufujof.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_off000158a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A4 5224 bytes
SHA-256: 917221b00918be44fbab280203b1ef636feea8a3a7a2b46e77f527683d36dff2
font_01_sfnt_off00016a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A6A 11152 bytes
SHA-256: f9ee33ad60160b46812d0ba83d18f16ed82aa922fca03bdc54a06150f73fb3c8

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