Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cfe13129e963eb…

MALICIOUS

PDF

70.3 KB Created: 2021-03-28 18:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30cdba7c9a453ea515d65ecd071b7f1a SHA-1: cb8f1f2878c13352111a6318c039a6d7a173ca1f SHA-256: 14cfe13129e963eb42430d8011f94ffaf4faeeed37358d6dc6400d0d83f7428a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=husqvarna+261+price
    • https://cdn-cms.f-static.net/uploads/4370097/normal_602c5142f4047.pdf
    • http://bit7.top/66331157148mnrwj.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • https://gemigefe.weebly.com/uploads/1/3/4/6/134602098/2507328.pdf
    • http://rostov-mobile-doctor.ru/nesibirasatosuueqwv.pdf
    • https://jajonugofetafis.weebly.com/uploads/1/3/0/7/130776034/fonavivibe.pdf
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/2723649.pdf
    • https://cdn-cms.f-static.net/uploads/4489041/normal_6033cc0851146.pdf
    • http://musc-media.xyz/les_miserables_victor_hugo_summaryxm8qk.pdf
    • http://nezatarofarix.getenjoyment.net/bise_sukkur_inter_result_2020_download.pdf
    • http://dressnbuy.com/50109291890dy1ve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a34eb283-679c-44c2-8239-57584d0d508b/tarot_cards_rider_waite_barnes_and_noble.pdf
    • https://s3.amazonaws.com/gogunabones/cardinality_of_sets_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/1c5a3f06-fe4a-4d20-88a0-bd6e66d7a149/leading_from_the_inside_out_the_art_of_self-leadership.pdf
    • https://uploads.strikinglycdn.com/files/af02ec1b-09f5-4a45-8447-4777728b31c0/libro_de_historia_de_quinto_grado_de_primaria_paco_el_chato.pdf
    • https://s3.amazonaws.com/ragejufa/4348195038.pdf
    • http://tuzuxutetug.atwebpages.com/national_geographic_almanac_2020_free_download.pdf
    • https://uploads.strikinglycdn.com/files/94876126-7095-4e74-abdb-ed9632bacd81/to_kill_a_mockingbird_chapter_9-11_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/8090f449-c237-4feb-a300-21c1ddb64c6d/sharp_el-2196bl_calculator_instructions.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d486.bin
f1b2dfdb87de4d619c99af0557716e591ef60b10f4bc2a90b76b4e3ca56e424b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 5380 bytes
font_01_sfnt_off0000e6f3.bin
1227f3108d417c77260ad1b6cc59098315303ce53a05e155b5bde666ae38edac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 10800 bytes

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