Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa84a387ea1c4213…

MALICIOUS

PDF

83.2 KB Created: 2021-02-01 01:01:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9e2e03bb8aa473a6876a404e40f8b741 SHA-1: e6378bb96ae1edd1f2ec70614eda0f097ef1331c SHA-256: aa84a387ea1c42134ce9bd6940ba8858d141ded9d794aa57a36e5283572287bc
192 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the embedded URLs and heuristic firings suggest the document's primary function is to redirect users to malicious sites, likely disguised as software cracks or other lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=lightroom+crack+ita In PDF document text
    • http://questotzvezd.space/lapse_ending_guideu5ent.pdfIn PDF document text
    • http://rexapeduke.66ghz.com/pobirexogapupeso.pdfIn PDF document text
    • http://dhl-order.info/injustice_2_xbox_one_digital_codec8u5k.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/idYgjHm/skyscraper_demi_lovato_karaoke_piano.pdfIn PDF document text
    • http://wiinorama.fun/53992099578p5am1.pdfIn PDF document text
    • http://civiliscmq.online/tank_attack_3_tanks_2d_tank_battleship187dz.pdfIn PDF document text
    • http://afracheat6.xyz/48878417073ccqkb.pdfIn PDF document text
    • http://blu-ital.space/faxodevz7gw1.pdfIn PDF document text
    • http://vir-tus.com/kuzogazorezocy2te.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/d8jgget/65538628094.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/icao_annex_19.pdfIn PDF document text
    • http://snatural.space/tactical_battle_simulator_mod_apk9y6j0.pdfIn PDF document text
    • http://netlysy.online/75480061378uk442.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/eEibZhj/snapchat_streak_help.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/UEe7Hjc/supplementary_maths_class_12.pdfIn PDF document text
    • http://tozepefaj.iblogger.org/counter_strike_online_windows_10.pdfIn PDF document text
    • http://paypallsecurity.com/vmware_vsan_6.7_u1_deep_dive_download5ytzh.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/dmjhhgA/54172543694.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/bivanud/car_logos_and_names_list.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_off0000d8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A3 5736 bytes
SHA-256: b342978988958d91cd55422d1909f117a79dba02b3e5505adaf52cdc754cc641
font_01_sfnt_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 5008 bytes
SHA-256: c8008f428d9b1359ad5eef2e3a79943e2bf06849c2f23a6b81565187a82809bd
font_02_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 14704 bytes
SHA-256: 44da80be6873a73002caae068354d5ca7e9fcf8a44835139a83ce6a2f296f5f6
font_03_sfnt_off00012987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12987 16300 bytes
SHA-256: 89e5fb9ace37bfd0f54f608544ce733642c02011f755d9b7bb248b801a3535aa