Malicious PDF — malware analysis report

Static analysis result for SHA-256 471fcf74a8bc88f8…

MALICIOUS

PDF

74.2 KB Created: 2021-05-22 09:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 06ebaf77d74492f7f4826f47c5c7149a SHA-1: 1bf00275e0dc632f72edff237a5ce024f7634ab1 SHA-256: 471fcf74a8bc88f8d3a0d20fa5a2888764e07fa9039c333f586ede01504d838d
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://dafemum.ru/strik?utm_term=how+do+i+install+my+webcam+on+my+hp+laptop PDF link annotation
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/zinivabarigir-fivivu.pdfIn PDF document text
    • https://wuxuvekukiku.weebly.com/uploads/1/3/1/3/131380251/gerezezole-suwilikofug-xinifeb-pijopewowasofa.pdfIn PDF document text
    • https://wenojobopowegit.weebly.com/uploads/1/3/4/8/134879608/remus.pdfIn PDF document text
    • https://kemewekodu.weebly.com/uploads/1/3/1/8/131857474/0f9cdd5672.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3a6094-0a64-4ad6-9429-ec10185c428d/lg_refrigerator_cooling_but_not_enough.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/19146739570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eaf97a7-1cf8-4107-b8cd-4d6091f53d63/how_do_you_reset_the_flashing_light_on_a_maytag_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/baadshaho_movie_naa_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3abf912-b224-4ba2-bb2a-acbda70fc26b/41053452704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ebe6b6-55e5-43f6-a4d6-bee51b4b996b/fesuzumamuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d3985a-dddf-4039-933d-c6e3b82792ac/xejesefevi.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/fifuwun.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/nuxowanuxutexo.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/302803679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/522fb2bc-85b7-4684-8cc1-39467d7a239f/35261705189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f7c722-608a-4bf1-b99a-097a363ed271/kebaxiwunoje.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/38166389247.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/vivafiposowexazofavaguvob.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/seiko_chronograph_100m_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7946d73-0778-4a6c-86b3-04ecf9a87dcb/which_is_better_honda_civic_ex_or_lx.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/sherlock_holmes_a_game_of_shadows_full_movie_download_in_hindi_dubbed_480p.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_off0000e442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE442 5512 bytes
SHA-256: a39ff5cdc70a32edfe798c08409d1d7ba9d90043c5e0fb63fa2b873e897ef610
font_01_sfnt_off0000f6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6ED 10624 bytes
SHA-256: 138b9034d4abf751a0843b93c4f787eeb4ca0a1372b1a945a2a884998ebac4ad

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