Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df22cc8c8460404…

MALICIOUS

PDF

87.3 KB Created: 2021-03-19 14:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 04745e82550d3bbdfd5d89948442613e SHA-1: 689d463da083d4bba8dc0a017d1b5cca6b47198f SHA-256: 1df22cc8c8460404ad0c18c831825fb6f8ada7946b85572b86335d7b41a2fba7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable domains, suggesting a link farm or phishing operation. One of the primary URLs extracted is 'https://gimoguvi.ru/aws?utm_term=what+wrong+with+my+whirlpool+refrigerator', which appears to be a lure for users searching for refrigerator issues. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://gimoguvi.ru/aws?utm_term=what+wrong+with+my+whirlpool+refrigerator PDF link annotation
    • https://pegepigav.weebly.com/uploads/1/3/4/4/134481067/zirewixewukexiwaxonu.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzufoxo/e8hifT0/polytone_mega_brute_schematic.pdfIn PDF document text
    • https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/fofuzilelo-vuzavurupo-zukapebu-lefuvewulepisu.pdfIn PDF document text
    • http://ritikutoxukor.22web.org/tepobojabixoveserujo.pdfIn PDF document text
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/3864724.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/GzcTgcX/speedy_cash_near_me_phone_number.pdfIn PDF document text
    • https://guwagigiruf.weebly.com/uploads/1/3/5/3/135303004/tukake.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/hiegi0l/big_head_soccer_championship_mousebreaker.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/cPnSjih/lenovelev.pdfIn PDF document text
    • https://naxosunibeg.weebly.com/uploads/1/3/4/6/134676516/a8f3b.pdfIn PDF document text
    • http://jabakibiv.iblogger.org/2018_toyota_camry_xse_v6_black_top_and_red_interior.pdfIn PDF document text
    • http://dorubugupik.22web.org/how_to_hook_up_dish_network_remote_to_tv.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/3030d2e3-51d0-4557-b755-f1882c16886a/los_juegos_del_hambre_sinsajo_parte_1_en_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/44929969980.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/xogonulamerawodidaxutifep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2e1f9c-3d0e-4884-b683-dbf11661f4fb/how_to_use_a_sewing_machine_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6966f973-6f69-486b-afd9-16a34005c9dd/fe_mechanical_practice_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/5059903167.pdfIn PDF document text
    • http://rijewetevoxo.rf.gd/yoga_breathing_exercises_for_stress_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5b56d2-3672-4c39-a2bd-abdcbde13b95/72137482047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4064dc-7de4-4aa2-8288-00cc40d86053/how_to_treat_diabetes_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f62461-f2bf-4c1a-b282-40d3063cf9b1/stephen_quiller_color_wheel.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/vivah_movie_song_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/242ab135-d1d8-4dbf-bf3c-011f658c3782/80229309754.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 5344 bytes
SHA-256: 748b3fa73665ddf5e3aeac7f6d2eb2b72668334c6d8ad1ac95c4dda7c7c1b667
font_01_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 11104 bytes
SHA-256: 33005fdc7db236a6b31c6e5e072dfc4103b99051747880f561851681901afc64
font_02_sfnt_off00013900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13900 16292 bytes
SHA-256: 9b6b90087ad242a037c4abcda3a7e1e6f720f468737e54aa4fd5e99d079103e1

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