Malicious PDF — malware analysis report

Static analysis result for SHA-256 5548cc1cdf1c818c…

MALICIOUS

PDF

89.9 KB Created: 2021-05-03 03:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 67dfc93eb2a946d4982cabc8f506f9ea SHA-1: c0b4efc361f2027214fd70c25d56cabd5c756024 SHA-256: 5548cc1cdf1c818cf9e38b6360a468adfb959f8a5aa8f2915b72c7d644a522b2
164 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or SEO spam campaign. It contains a large number of external links, many of which are hosted on `sqhk.co` and `filesusr.com` domains, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://fokemale.ru/strik?utm_term=little+house+on+the+prairie+season+6+episode+18 PDF link annotation
    • https://cdn.sqhk.co/pegipoveridi/iiVRjfQ/nenejivivajofiwetusoga.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/fC3Zjfk/34844124818.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/FhgjPja/game_maker_studio_for_windows_xp_32_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/wEhdjid/90046793513.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/ehbz57l/santorini_white_architecture.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/jeGNghR/anjaan_race_wars_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/iDijgi1/super_smash_bros_melee_adventure_mode_falco.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/OheT4tO/ios_14_lock_screen_widgets_not_working.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/YjeQfib/iron_blade_medieval_legends_rpg_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kulamogo/nhdhgvz/ear_infection_drops_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ibpfhdx/swipe_brick_breaker_tricks.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/tjchfii/fizid.pdfIn PDF document text
    • https://cdn.sqhk.co/xujanezujol/8Uqogf7/zegiwuxesetikut.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/cidicoq/dundee_stars_ice_hockey_players.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/jzGLeUk/wcac_football_championship_2019_live_stream.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_c3bd936aa76c44ab951948240b0daa3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce45d6fb-dc8a-4971-b901-a2dc5c044c01/how_to_culture_daphnia_moina.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_9290ab164fa044738f57d6d06c5399c8.pdf?index=trueIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_3c2bd02276354c2c936f4feba9509743.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84625a92-421b-47a1-91d1-66898fc35232/wivinumagaju.pdfIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_a745db42db1f4b1baf3ca230ff802997.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 5388 bytes
SHA-256: 790686aa960193ed4fef697a757a1619a813e5c17f43f6aac59700536d6c687d
font_01_sfnt_off000132e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 11496 bytes
SHA-256: 2784bf266db1d7f463fe72d2154814f953d292f9322e240a963df92fa3bd6944

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