Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b56236dd4ac2f0…

MALICIOUS

PDF

85.1 KB Created: 2021-03-18 05:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5bd2df53630c3f579b2f619fd1406381 SHA-1: 517c04c9f516daa0b0aafa9a8b978d757f53fbf9 SHA-256: a3b56236dd4ac2f049bb308dcd0a09b62edc342d5a8366bd3f6f11e246ef5f84
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/award?keyword=a+room+of+one+s+own+pdf+virginia+woolf PDF link annotation
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/juzolul-xewiruxawababe-bipove-kaged.pdfIn PDF document text
    • https://cdn.sqhk.co/dopebuxoz/hggiUjg/pevezarixorubumejulenixek.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwagezo/gehjjjc/everyday_jigsaw_puzzles_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/idijyzA/arcade1up_black_friday_2019_target.pdfIn PDF document text
    • https://jagalanir.weebly.com/uploads/1/3/1/0/131071056/1916556.pdfIn PDF document text
    • http://guzolemidova.iblogger.org/bangla_awas_yojana_list_2020.pdfIn PDF document text
    • https://putoluvutawubu.weebly.com/uploads/1/3/1/4/131437806/e164d93b7d0bf.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/bulolimepol/how_to_talk_about_diversity_and_inclusion.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/satufarulalebigadupe.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/answer_to_picture_riddles.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/zanivodizutesovobu.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/origin_of_the_species_u2.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/troy_bilt_power_washer_2800_psi.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/50776567750.pdfIn PDF document text
    • http://tuwafuvokix.rf.gd/how_to_unlock_lg_tracfone_flip_phone.pdfIn PDF document text
    • http://dixuzudes.epizy.com/free_inference_worksheets_for_first_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/keylab_61_mk2_manual.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_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 5500 bytes
SHA-256: 1034e42cb9db951b5025e52c61cb9843f8b941b74d700405eeb666e6771e7632
font_01_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 11568 bytes
SHA-256: ff8402b54aeb0b9f1fa2b3e6989f14e2d7d92587c24cfd0113e3da3fc59afe9d

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