Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf6a4b492979c0b…

MALICIOUS

PDF

77.8 KB Created: 2021-03-10 06:45:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ea310f3cc06b33048ac8122e4da1db0f SHA-1: 07d395dd7bf7b64ceb6b91d516b7cccee79d5d68 SHA-256: 4cf6a4b492979c0b1c6962ffe69ddb179b57610d45778ea371798d57571faf2d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple heuristics indicating it is a phishing lure, including a link farm and an SEO redirector disguised as a free translation service. The primary malicious URL, 'https://midufefew.ru/strik?utm_term=traducir+espa%25C3%25B1ol+a+portugues+brasil+gratis', is directly linked to this lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=traducir+espa%25C3%25B1ol+a+portugues+brasil+gratis PDF link annotation
    • http://nijewogifuzazi.mypressonline.com/36237788822.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/free_online_gre_prep_materials.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/how_to_update_fl_studio_20.pdfIn PDF document text
    • http://kemutedetabu.scienceontheweb.net/50790713977.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/bc77b80c-c960-4b82-a7d5-e2f0ac883adc/lazixakezenilogakep.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_53632a120afb485c81955cc95589c460.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/aluminum_roofing_sheet_thickness.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/75503636795.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/bs_player_pro_1._31._197_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3672eaee-e73c-4866-a604-53658903db79/begatodum.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/xomuwukogufivefo.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_f08a2844262d40d5aa14b6b2eaa68876.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/android_apps_apk_cracked.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_7467d84d2059456f8339bdb5f6d89168.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/zojisovesanato.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/17858500830.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/mergers_and_acquisitions_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f973ee7f-df97-476a-b1f3-687ebeffa14c/98428319169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2bc2e45-d0c1-4c46-ba08-7e855768b3aa/how_wide_is_a_sony_55_inch_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/vudikerobiwe.pdfIn PDF document text
    • https://9ec55029-67b1-4fe0-9a5d-40fd638ac594.filesusr.com/ugd/dc5a51_67b539ad842141d99d888ddb0e5e87d0.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_4a7bab8b8ffd4ca5ac676e2a68157ae4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2b548d-c6e7-483c-9d51-c5d4a0150fb5/nancy_drew_season_1_episode_3_trailer.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_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 5544 bytes
SHA-256: 0c3f7f55c0b8f19a88ebc649404da73ca59703f422f73a56379b443e650ba68e
font_01_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 12212 bytes
SHA-256: e58e97be6e83ce99ab23bd67ff2bd0bfaed56b798e46d62705a8e34b1dbdf59e

Open this report in the interactive analyzer, or submit your own file for analysis.