Malicious PDF — malware analysis report

Static analysis result for SHA-256 a470e18cc1888b08…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 19:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 87e7d3b01dd8714e20e205d2189b520f SHA-1: 1eea2999a06856bf117b80888367a1ffe3e3895b SHA-256: a470e18cc1888b08207ea46cdde8cdadc6969ffa9676557ca058cc2a63034932
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and unreadable, but the presence of numerous links to disposable hosting and redirectors strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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/wix?keyword=troy+science+olympiad In PDF document text
    • http://tosefabebiribow.scienceontheweb.net/dugolet.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/diccionario_de_biblioteconomia.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/ahciiZQ/bose_soundlink_color_bluetooth_speaker_ii_soft_black.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/ZN0lihq/7397668721.pdfIn PDF document text
    • https://cdn.sqhk.co/romumoxoleno/05Zicr2/two_way_data_binding_reactive_forms.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/fxY6ghg/81964396655.pdfIn PDF document text
    • https://cdn.sqhk.co/baziwuwe/3vgftvd/bamatozawivodagudizibe.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/jhIpiaB/95776016860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_6019b50a16c3f.pdfIn PDF document text
    • http://tadajixilatu.scienceontheweb.net/abstract_algebra_dummit_foote_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/jbrhaW3/ziloteruduxuwumojotizile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463264/normal_6045e2d39f61e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471706/normal_601c5f236efa9.pdfIn PDF document text
    • http://legegapepapo.medianewsonline.com/89634391562.pdfIn PDF document text
    • https://cdn.sqhk.co/gobavata/jf3girK/fubefixijofalojusovar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_602c99945c168.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_60039fb97bc46.pdfIn PDF document text
    • http://pikufufunuti.scienceontheweb.net/43236139538.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/xefezesebusu/flysky_gt3b_battery_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/how_to_make_a_vrchat_avatar_in_blender.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/how_does_the_walking_dead_comics_end.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/24898244171.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 4980 bytes
SHA-256: f30412116b80ad86d8c84a329b1555025351bf2b852b3207893a5087a076fd85
font_01_sfnt_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 10332 bytes
SHA-256: 5302e9a942a52f99b69944fe6e0daff907bac17c5eadd87e8642e02eba6b5d9d
font_02_sfnt_off00011495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11495 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e