Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5ce22291ced631…

MALICIOUS

PDF

83.3 KB Created: 2021-03-20 21:16:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a268a7572bfa8765aab8363a15a29865 SHA-1: e82fb794b94f5e78bf73fee912789b1424636875 SHA-256: 2a5ce22291ced631d96598e731f734e587d97564814bbd81d22689a3335fbd8c
156 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 are hosted on dynamic DNS services or link farms, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The embedded links are designed to mimic search results for technical documents, aiming to trick users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 5

  • 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.
  • 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://pelibifir.ru/123?utm_term=4800b+mosfet+datasheet+pdf PDF link annotation
    • https://cdn.sqhk.co/dexediwiboze/ibmhggt/78070833031.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/aiihRjd/teachers_pay_teachers_gift_voucher.pdfIn PDF document text
    • https://danabemove.weebly.com/uploads/1/3/0/7/130776083/fa68e7995.pdfIn PDF document text
    • https://wevopuvigamez.weebly.com/uploads/1/3/4/3/134320632/9235486.pdfIn PDF document text
    • http://ziduruwekomowob.iblogger.org/the_tale_of_the_dueling_neurosurgeons.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/4gjlPnr/hd_girly_wallpapers_for_mobile_phones.pdfIn PDF document text
    • https://cdn.sqhk.co/lokuwanij/Uicggdy/2019.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/idUgc18/tofewozetuti.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/jfiadvY/youtube_studio_combine_videos.pdfIn PDF document text
    • https://jikuvagipotax.weebly.com/uploads/1/3/4/6/134647272/5575848.pdfIn PDF document text
    • https://fikakexuk.weebly.com/uploads/1/3/0/7/130775276/3760740.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/ijhBhaM/call_upon_my_guardian_angel.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/hfDAT6F/how_to_automate_reports_in_python.pdfIn PDF document text
    • https://bowilidorufe.weebly.com/uploads/1/3/4/6/134603038/falutaw_labebiporon.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://s3.amazonaws.com/jamuluvuvava/nc_cosmetology_state_board_study_guide.pdfIn PDF document text
    • http://tivusanezidiv.rf.gd/goxutizunafurik.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/ti_nspire_cx_cas_4.5_0_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/hong_kong_climate_change_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/cron_job_schedule_format_in_unix.pdfIn PDF document text
    • http://nonixita.rf.gd/domino_s_pizza_lebanon_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/finding_inverse_functions_algebraically_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/willy_wonka_and_the_chocolate_factory_movie_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/einstein_riddle_houses_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/clia_cruise_travel_report_january_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/bell_bottom_kannada_new_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/30946493063.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_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 5256 bytes
SHA-256: d2ec2e54c216a5daea67a4b03624dcedcc22363f6cdd452ada6bb475baf35105
font_01_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 13404 bytes
SHA-256: a1d68aba011917d3e2f3660d616192f14097af1b285e6dfde5722b70146eaea8
font_02_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 16168 bytes
SHA-256: 13596defb2bcc6fc1048af8e1a4b019015f57a35384aba88f9e1637b8f94b635
font_03_sfnt_off000130af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34