Malicious PDF — malware analysis report

Static analysis result for SHA-256 81537fa198e6ba93…

MALICIOUS

PDF

84.3 KB Created: 2021-03-19 15:50:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: dfa458836b294a0fe75630c30d564a18 SHA-1: c8af077d5a058ad8d1445883a1274664a1dba663 SHA-256: 81537fa198e6ba93678b6ef6db9ab64ba8756ff2c6c550a328dbce6647a478b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF SEO Link Farm', suggesting a tactic to drive traffic to various resources. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://static.s123-cdn-static.com/uploads/4381546/normal_5fc70b4ec0778.pdf In PDF document text
    • http://kimisorunutom.medianewsonline.com/soxavavabesididufiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fcd5da12852e.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/6682062.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/gfjg2ic/cinema_tycoon_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5fec5b16680ab.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/jbtfcPK/tozuxina.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/pdf_converter_to_word_document_free_download.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/riliterolapafemuf.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/donifarelasodot.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/hcDibNq/break_up_facebook_and_twitter.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_600e614936760.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5ff4fe3cd36ba.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/c85c75.pdfIn PDF document text
    • https://lexixare.weebly.com/uploads/1/3/4/3/134354354/rubiboreji.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/28581035461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467950/normal_60041b129ae8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_5fee77f8e3631.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/n4t4wXRn-MA/wb?keyword=vrio%20framework%20example%20retailPDF link annotation
    • https://s3.amazonaws.com/kavalukato/who_was_cains_wife_in_the_bible_and_where_did_she_come_from.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/european_certificate_of_conformity_mercedes.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/make_text_bold_in_string_android.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_off0000f77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77E 5056 bytes
SHA-256: 6d41f710f65b2c4c08e296c6d7fb52045af8374046a5f4cfe93a27bb655b2520
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 10960 bytes
SHA-256: f8fb1f55e428402e59f87055c7bc27f8c6931de1cbc27012547c25dce9ffff65
font_02_sfnt_off00012e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E50 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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