Malicious PDF — malware analysis report

Static analysis result for SHA-256 b194ffe0f28763b7…

MALICIOUS

PDF

67.4 KB Created: 2020-12-16 00:09:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: be3c0c5a9f5c497c25abc4a0ae725472 SHA-1: c858cc906dfaea89887e49e98029fdfbce20d0b5 SHA-256: b194ffe0f28763b74dcfb95dbd0d7f50ba64bc36acf0d090854ac76a26c21200
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to lure users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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://ggtraff.ru/123?utm_term=guinea+pig+toys%25EF%25BF%25BC In PDF document text
    • https://basuxebuj.weebly.com/uploads/1/3/1/3/131379820/1057619.pdfIn PDF document text
    • https://gekilatati.weebly.com/uploads/1/3/4/3/134378061/adf72db55.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/9644245.pdfIn PDF document text
    • https://kuxiwidozerapi.weebly.com/uploads/1/3/4/7/134728536/waxebemanesubogal.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/kasilezalo.pdfIn PDF document text
    • https://pasukanat.weebly.com/uploads/1/3/4/4/134474220/1f8196e.pdfIn PDF document text
    • https://subonotewus.weebly.com/uploads/1/3/4/3/134347286/bofumegumu.pdfIn PDF document text
    • https://lalidusuferub.weebly.com/uploads/1/3/4/4/134440540/fudolezasapobodijobe.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/8cfc6042-b178-4fb1-a957-ff1f304b6341/11507908614.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc543c640f1034a5cc59a4f/t/5fd709daacac596b0cd1ea48/1607928283553/51776822554.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc12cb3a13a450babf5d3f9/t/5fc338adfa04221c7188ad7f/1606629549696/amigos_da_terceira_restaurant.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0028ac14dfd36feec75cc/t/5fc189fea97599144e31d29c/1606519295981/34845424753.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3a23e7848ba205d29b2a8/t/5fd230465e090321cabdb078/1607610438305/smart_home_manager_app_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce22c18a652741489aed3e/t/5fd6b690d654060362d4f9fc/1607906961237/board_games_templates_free.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_off0000c951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC951 5000 bytes
SHA-256: ef6f41bf56c4b16b5476c8e88802472518626d9ab578fc8d050f6990878cc8bb
font_01_sfnt_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 10944 bytes
SHA-256: aea0d27107e75caaf09454add9fe3556c1c1d98f0f4e6482409cde690789308c

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