Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf3f3329c14e0f0…

MALICIOUS

PDF

87.0 KB Created: 2021-02-23 19:11:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c07298894775d6d224d9f053c4b02449 SHA-1: 4c788f7dfdb0e2c332d086a6ebd4f79e40eae55b SHA-256: fcf3f3329c14e0f0c25f40fe6969bd6ad985ea89417497d52868528d4d0acd99
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm designed to attract traffic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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 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.
  • 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://crophysi.ru/wix?keyword=download+clash+of+clans+hack+apk+ihackedit In PDF document text
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/39859e07.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/Ghhjfj0/wallpaper_4k_for_pc_2020.pdfIn PDF document text
    • https://tajuwelaf.weebly.com/uploads/1/3/1/0/131071184/gabego_wavofejeguxe_bolaruxitekiw_derusabiv.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/pncib3U/23230366664.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/h0xbiiv/furniture_for_minecraft_1._16._2.pdfIn PDF document text
    • http://kekanavaresem.iblogger.org/appraising_and_rewarding_performance_chapter_6.pdfIn PDF document text
    • https://kitogabizog.weebly.com/uploads/1/3/6/0/136053612/1517289.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/iaV78je/action_movie_actors_name.pdfIn PDF document text
    • https://jewutejaj.weebly.com/uploads/1/3/1/0/131070173/4e083.pdfIn PDF document text
    • https://kozikimonewuzo.weebly.com/uploads/1/3/4/5/134592445/774a3161.pdfIn PDF document text
    • https://cdn.sqhk.co/toridezoxiko/iyjhkjh/elite_clinical_trials_inc.pdfIn PDF document text
    • https://cdn.sqhk.co/moxelutedoje/hs3l5jf/62585411379.pdfIn PDF document text
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/rowefa_luxovutuduxuz_zinesu.pdfIn PDF document text
    • https://cdn.sqhk.co/rebamomidaw/iWBnDai/tokaido_shinkansen_stops.pdfIn PDF document text
    • https://cdn.sqhk.co/pikukafil/eRujjuq/toca_touch_trainer_price.pdfIn PDF document text
    • http://mananeje.66ghz.com/best_video_player_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/ff7hiU9/palapib.pdfIn PDF document text
    • https://fejilezujew.weebly.com/uploads/1/3/4/3/134340931/waxuviseratol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/byju_s._apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/59386417236.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/sugukevugediwopujuwesa.pdfIn PDF document text
    • http://kojeziponoduv.epizy.com/82364366937.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/best_android_smart_tv_box_australia.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 5304 bytes
SHA-256: 648fb4ffba5cd4630785ff3a396d09d22d3ddcdf13a32e455713d565a5f0e3c2
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 2356 bytes
SHA-256: c14480c22897f7f7718257165a07d0f3b8074788c191ffb1a0ea7f336f43a6eb
font_02_sfnt_off00011312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11312 10708 bytes
SHA-256: 0581fd6088c389d762732cc2db468226fcd564007b72a5eb9246bca5965601b3
font_03_sfnt_off000137f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F9 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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