Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad728ef8e086d629…

MALICIOUS

PDF

76.7 KB Created: 2021-04-03 04:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 57d43ddc80dcf05b7e4aa292cf4aec08 SHA-1: d720cb4b9d2ec52bf941d8c861a348954b507646 SHA-256: ad728ef8e086d629230ad8e23dc6721adfd30dda4aeb6994eec8b1ce1b5f7750
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a phishing attempt. It contains a large number of external links, many of which are SEO redirectors designed to lead users to malicious websites, such as the one at 'kogutipabu.22web.org'. The document body, though partially garbled, suggests a lure related to children's crafts, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/123?utm_term=manualidades+para+ni%25C3%25B1os+de+primero+primaria PDF link annotation
    • http://kogutipabu.22web.org/totemot.pdfIn PDF document text
    • http://chempion.coffee/97912867887poaoi.pdfIn PDF document text
    • https://zovakobazala.weebly.com/uploads/1/3/1/4/131456363/tuzitujosodife.pdfIn PDF document text
    • https://reragoposezexel.weebly.com/uploads/1/3/5/9/135958934/e2e75564.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/9526517.pdfIn PDF document text
    • http://clientbluebadge.com/life_lessons_elisabeth_kubler_ross_free_downloadk4kv0.pdfIn PDF document text
    • http://tuimag.ru/mac_screen_recorder_with_audio_apptq31y.pdfIn PDF document text
    • http://my-credit.info/pasuwafilezoncrbvk.pdfIn PDF document text
    • https://bolukuja.weebly.com/uploads/1/3/0/7/130739437/vowodesixutupuzarul.pdfIn PDF document text
    • http://thesimplycompleteseries.com/buck_owens_songscjsa0.pdfIn PDF document text
    • http://nobebinexogiris.iblogger.org/89032659623.pdfIn PDF document text
    • https://gasatuba.weebly.com/uploads/1/3/4/5/134596028/9f11f4541.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/davawina/38998466696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e07671c-2482-47a9-9954-8fb09c637bdb/6666941473.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/kevekebolixit.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/memamogufaruw.pdfIn PDF document text
    • http://zifasodokid.epizy.com/android_emulator_version_9._0.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/majesty_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749a9764-67ee-4414-9f30-191880820458/lisopulumugewefasekoki.pdfIn PDF document text
    • http://funazowo.rf.gd/roboto_black_italic_font.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/675bf9ee-0cf1-4e51-8618-755c8fe4c6ca/60194429424.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07e6fef-a1e4-422a-997f-cee68518e675/before_the_law_an_introduction_to_the_legal_process_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0c42faf-e143-4926-ae3f-915322e5f06e/acordes_de_musica_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/bavaxafebobadojojanewe.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_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 5324 bytes
SHA-256: e4e125dc48a8b20b6316d9f2a7b0a116180c99ce90e7e43c920affc5fdd8699f
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 12172 bytes
SHA-256: bb4111c391321a3801f89cabfb91d1e56e23f13adf50ba927e611655788eee75