Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd066a06091c179d…

MALICIOUS

PDF

77.8 KB Created: 2021-04-01 04:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fea710ab178d5feb03bf102e3cb43182 SHA-1: 51aef6e466e4434ad09fc50598e4bc97a30cdc1d SHA-256: cd066a06091c179d9abd7ab7aa38b9968e7e616523e9ababe4f9ff758c253408
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://yafferge.ru/strik?utm_term=intellicharger+i2+blinking'. The document's structure and the presence of many links suggest a phishing or scam attempt designed to drive traffic to malicious sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=intellicharger+i2+blinking In PDF document text
    • https://cdn.sqhk.co/nuroteditu/gdTkmm7/53930419720.pdfIn PDF document text
    • http://wordsideget.top/raise_your_glass_song_lyricsv2cqi.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/hjhjk7x/tower_color_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jabupexipa/9RVIK7i/jukukekajemix.pdfIn PDF document text
    • http://graatorama.fun/xunopiporakutotijonibepapcbtz6.pdfIn PDF document text
    • http://faligabab.22web.org/66342451509.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/cjjAPjd/laser_quest_danvers_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/PigEidJ/jodaratogozifubamebakeda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4e0d19ac-da3c-44d3-b0ee-f20d4edfdfa6/body_language_book_in_arabic_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/what_is_kakashis_red_eye_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16109050-5afc-4577-a5b9-cdce61bfefa9/nuvalidefoz.pdfIn PDF document text
    • http://jowekenivuzex.rf.gd/30630051845.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/28462814157.pdfIn PDF document text
    • http://vezifapix.epizy.com/ralikedumog.pdfIn PDF document text
    • http://zitilola.rf.gd/xutapozusodurofet.pdfIn PDF document text
    • http://piwirapofo.epizy.com/android_free_root_file_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2770f9c-8a0b-43f5-a86b-37a7dc44a2c1/lesopuzunobavowotiko.pdfIn PDF document text
    • http://wafogaz.rf.gd/aithey_aa_ringtone_instrumental.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/39593961979.pdfIn PDF document text
    • http://wagibederujejo.rf.gd/anarchy_arms_workout.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/what_book_comes_after_the_colour_of_magic_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 4836 bytes
SHA-256: ec3416edbebeaefe3e77a4b07dd7de560592663145764146a865107f58999961
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 11156 bytes
SHA-256: 0b740b9f6745043548e90d50355594d5cf7ddcd9e8ddef3dd097f96787f283f6
font_02_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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