Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f09b95bf5611bcd…

MALICIOUS

PDF

67.2 KB Created: 2021-04-03 10:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 41b25f3158b58e547c224dbe13be94ed SHA-1: aaf0b1a31cf11c213a27a39f6fce43e6449af684 SHA-256: 8f09b95bf5611bcd52e0212714f10dee81594980e44a4094847f16cfed4eda8c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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.
  • 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://seumenha.ru/wix?keyword=norton+field+guide+to+writing+with+readings+5th+edition+ebook PDF link annotation
    • https://matisosu.weebly.com/uploads/1/3/2/6/132681513/mebova-dareku-wubez-sopoxir.pdfIn PDF document text
    • https://verulofu.weebly.com/uploads/1/3/4/0/134012380/292c786e45a.pdfIn PDF document text
    • https://peneredexamoje.weebly.com/uploads/1/3/1/4/131407565/bejuwonito.pdfIn PDF document text
    • http://begdas.fun/kopulorumesinubokozozib6sm9n.pdfIn PDF document text
    • https://xososikanezav.weebly.com/uploads/1/3/4/8/134892973/6d89a3deb698c.pdfIn PDF document text
    • https://pirulavedup.weebly.com/uploads/1/3/1/3/131379447/wabolugaluda.pdfIn PDF document text
    • http://voiprormul.xyz/innovative_technology_itut-201_usb_turntable_manualx01sd.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/dusined/84523278270.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/vusibagadimetexosu.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_ab7ddb6739ea486a9e04d645fe59429f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/hp_laserjet_pro_p1102w_laser_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/roomba_770_error_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/how_to_drain_bosch_series_8_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/god_guide_me_today_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/urine_culture_report_sterile_means.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/percy_jackson_and_the_lightning_thief_tv_spot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5048e18-811f-4282-b565-f8ef1f660557/high_anion_gap_metabolic_acidosis_litfl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/740c1b2e-1d43-413a-ab1a-2c1b22c8c923/tajugiropavirokawufisa.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_14cd40df6b464ce4822ba96b0c6afd5b.pdf?index=trueIn 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_off0000c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC818 5560 bytes
SHA-256: 6d4831d40e3b96fa0a91063368012a13dad1a41188bed3622ef51a95e8dc36d9
font_01_sfnt_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 10624 bytes
SHA-256: 154c7e38880d5cc299fa3dc9a35d7a1e84829707ea9f2ec0d0e1c9b7b539f8e4

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