Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3df3b9bdb598069…

MALICIOUS

PDF

76.8 KB Created: 2021-04-06 13:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ad41aa3b2dfdda8ff7bffc95139d51c2 SHA-1: 052ff5fd04e761cb607f708ecc0e7d180eb651e4 SHA-256: c3df3b9bdb598069b1a1d07e34fca371f8ebdadce2b0ef4e6a900ba9e6c35928
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The presence of a 'download button' heuristic and the structure of the URLs suggest a phishing lure designed to trick users into downloading a payload. No scripts were extracted, but the overall pattern indicates a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=google+drive+video+to+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495843/normal_5fd63cc7294dc.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/onn_digital_alarm_clock_radio_how_to_set_alarm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_601956280f958.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/Kijgijg/nawazanevitaxunukisoz.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/fjgiiR5/freeze_dried_food_storage_reviews.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/10874089855.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/58080336050.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/habit_3_put_first_things_first_examples.pdfIn PDF document text
    • http://kajuzumanaz.sportsontheweb.net/wamajiwifijakuz.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/72072210907.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/mdl_recruitment_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezixus.myartsonline.com/62042459262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9e333d-5391-4406-9445-84761d289e3b/is_the_word_mortal_sin_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bbc9aee-9ce2-4df4-86da-d083ef533c2a/pajetikoriputufe.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/99003647376.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/what_to_do_if_voltas_ac_remote_is_not_working.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_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 4924 bytes
SHA-256: 3649de541d7ce7fb5ed9c71fbf5f7c8564595e9160116bdf34d22eeedefeb493
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 10448 bytes
SHA-256: 4c22dad49506de0327256dff49d2d293041146c3eb6084e199a0feaf54e0f846

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