Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc171dfd9dff20e1…

MALICIOUS

PDF

84.6 KB Created: 2021-03-29 18:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ec0bb9e3ac2a904fdcc0b209df4bd7a SHA-1: a9212aff240f5279b345e205f1acab4be1f483e8 SHA-256: dc171dfd9dff20e17da68f0e110dd8fe8229f81383e4901f51456366041f741b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or phishing lure. 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 suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=building+management+system+pdf+free+download
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/a0bb011c0f4a.pdf
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/cc444104135.pdf
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/843baf3b.pdf
    • https://zulijijala.weebly.com/uploads/1/3/0/7/130740393/lodawugazuku_kisosobatisi_rajomajogesovak_xiwanigetub.pdf
    • https://cdn.sqhk.co/subilikiwi/ja6jarj/53886731792.pdf
    • https://cdn.sqhk.co/widafopaj/igkjbG1/68271785404.pdf
    • https://wamazuwo.weebly.com/uploads/1/3/1/3/131380988/fe12dfc.pdf
    • https://cdn.sqhk.co/levowexesu/hgjiig6/donanu.pdf
    • http://joblanc.xyz/denelexixunavoxuxutejixz.pdf
    • https://cdn.sqhk.co/bosesegivu/sgeO2fz/zidanalowagexirelaz.pdf
    • https://cdn.sqhk.co/xesagomi/jiiijjD/60940040798.pdf
    • https://cdn.sqhk.co/keserina/VTWflRW/best_strategy_board_games_for_adults.pdf
    • https://cdn.sqhk.co/jesisuvov/ctji7gg/video_player_for_android_pro_apk.pdf
    • https://cdn.sqhk.co/wepiwojeta/hijiRhf/93331170252.pdf
    • http://agencymedia-ig.com/honeywell_thermostat_focuspro_6000_th6220d1028_manual0y0x8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/divelatoxa/1982_toyota_pickup_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/b93afb1b-06fd-42bc-b560-c26f521dd07a/zitebikedomukapizenuwew.pdf
    • https://uploads.strikinglycdn.com/files/d8cb0483-37de-4a75-a162-161e2c4df0b3/59120303848.pdf
    • https://uploads.strikinglycdn.com/files/179a610a-be91-4306-929f-0f0d3929e422/canon_sx700hs_battery.pdf
    • https://s3.amazonaws.com/bojafazes/21272894176.pdf
    • https://s3.amazonaws.com/pewebopufupe/87198751420.pdf
    • https://s3.amazonaws.com/zuguvoxoki/airlink101_ar680w_manual.pdf
    • https://uploads.strikinglycdn.com/files/1faa9047-604a-4c6f-8f56-b5bd0141bb9b/58329824176.pdf
    • https://s3.amazonaws.com/julexekubaj/kashmir_university_date_sheet_2019_4th_semester.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010166.bin
c7a7e078c2cc601c48939fe89caabf67eb2b89da7e38228013dc157eb001476d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10166 5488 bytes
font_01_sfnt_off00011408.bin
e3179e36f0e62a9766c4630b80e082974658c837e1d0285e67be0be6643303d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 10080 bytes
font_02_sfnt_off00013686.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 4324 bytes

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