Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa1d71d5f3db689…

MALICIOUS

PDF

66.4 KB Created: 2021-02-18 02:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c5025db0a4a4b91d4d859ab9ff1b2469 SHA-1: 6f15260651c5cd6974bbb5eb8428a918eb69e938 SHA-256: 3aa1d71d5f3db689df920d91cd8e48f4d34fc54e93aed44b7d06c3ee909050ac
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one specifically pointing to a URL containing "duramax diesel engine repair manual pdf", suggesting a lure for users seeking specific information. The presence of a PDF link farm heuristic further supports the idea that this document is designed to distribute or link to other potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/wix?keyword=duramax+diesel+engine+repair+manual+pdf PDF link annotation
    • http://copyright-security-ig.com/407923946514vnqd.pdfIn PDF document text
    • https://zudibuliri.weebly.com/uploads/1/3/5/3/135319562/1823760.pdfIn PDF document text
    • http://helper-badges.com/mendelian_genetics_notes_answersnjfhc.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/1488113.pdfIn PDF document text
    • http://labincom-med.ru/alveus_formic_20_a55oopf4.pdfIn PDF document text
    • https://sexomimafu.weebly.com/uploads/1/3/4/3/134311134/3352085.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/8ibbgjm/58324686805.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/idQRgcM/25425813011.pdfIn PDF document text
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/1632606.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/iOrBahd/69188931440.pdfIn PDF document text
    • https://woxogobigevi.weebly.com/uploads/1/3/0/8/130814596/8383330.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxedanafowa/bifFjbI/zafukajisuwafoxa.pdfIn PDF document text
    • http://yozi.store/26080310434507q6.pdfIn PDF document text
    • http://taxiralimivi.iblogger.org/android_games_like_diablo_2.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/kokesatodixon/durga_amritvani_audio_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/35357168243.pdfIn PDF document text
    • http://jizemefuzix.epizy.com/sonalimixulajarefisego.pdfIn PDF document text
    • http://nokenamepewu.epizy.com/51526189245.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/41991392919.pdfIn PDF document text
    • http://suzekusopowe.epizy.com/javusoko.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/lesaliguzarevav.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/balak_palak_marathi_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/wondershare_video_converter_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/relieving_letter_format_for_employee_doc.pdfIn PDF document text
    • http://tajazenu.rf.gd/20831059583.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_off0000c5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F9 5428 bytes
SHA-256: 5d232768beeca885afe4c38d9f31c3d196a82ad01f49353de924af4f34dde603
font_01_sfnt_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 10416 bytes
SHA-256: cc6a4edf3962a71a667ded21c34c2e47ecf3dc0ebc47172364700a2ab4c28ce2

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