Malicious PDF — malware analysis report

Static analysis result for SHA-256 8871941bb7198ba0…

MALICIOUS

PDF

87.5 KB Created: 2021-03-21 06:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 126c5eaccdf9874629ab2ad851e3ad97 SHA-1: d9a8ef282e2789a93ba4eae3f863fac553a4e7cc SHA-256: 8871941bb7198ba0f330069eb81222702f10972a26d6f07d739b3d2f53989949
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain keywords related to popular media, suggesting a lure to trick users into clicking malicious links. The presence of these links and the ML classifier's high confidence score indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/strik?utm_term=attack+on+titan+movie+live+action+watch In PDF document text
    • http://winfreeiphone.xyz/182797691953ah7b.pdfIn PDF document text
    • http://lordtrans.ru/foziwapiwuvukiwl80fi.pdfIn PDF document text
    • http://fredo.bike/elements_of_civil_engineering_notesno92c.pdfIn PDF document text
    • http://idealicaitaly.site/cuando_a_la_gente_buena_le_pasan_cosas_malas_harold_kushner84syl.pdfIn PDF document text
    • http://harmony-market.ru/98374440513kp1bh.pdfIn PDF document text
    • http://emirofficialzm.com/tanita_bc-_601_software_deutsch_kostenlos8mmpy.pdfIn PDF document text
    • http://tryadasert.online/rudomaxevolofoleze3ncg4.pdfIn PDF document text
    • http://cmbmarketing.agency/fortnite_on_play_storea7ov9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijorud.epizy.com/92002158432.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/how_to_start_bosch_axxis_washing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/79646717769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4acacbc9-9865-471d-abb9-19230d1be4c6/adele_someone_like_you_karaoke_guitar.pdfIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_10b4ed1f54e649e88f9bd910a9414049.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18796466-a6a6-4979-afb1-be5803073eb6/jifim.pdfIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_ecf73b61d78b4c2c98fe0f74017cac40.pdf?index=trueIn PDF document text
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_1ddc40c05b994917bd7c56eac2ff0abe.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_516fd3c6824645959313f9cf8ceacf73.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_800c7dc820254a6299d38b8088475906.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdf2d98-7bc8-4068-ac75-2c720f1ec919/96261597846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ad54cd-4fee-489a-9178-5f68a45d717e/black_and_tan_mini_dachshund_puppy.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/wenemosenabaxemitufexob.pdfIn PDF document text
    • http://zowujobosega.rf.gd/88741310188.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/vezigaporajukof.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 4972 bytes
SHA-256: a2ea531b62450dca0968f404ee9e00c48be341d3b594e9dea77b27ac16ea1053
font_01_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 11564 bytes
SHA-256: 8fe3de847dfceae6312b729f32ae593416052c753dd3fc006039b94dc5aec2aa