Malicious PDF — malware analysis report

Static analysis result for SHA-256 123c8c3eebb1e4cf…

MALICIOUS

PDF

86.8 KB Created: 2021-01-16 12:34:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 09e351bdbf8d2ad24cff9e228997bdbf SHA-1: b8ade041ad4ccad3a4251a03cea63861ad299ad5 SHA-256: 123c8c3eebb1e4cf59d5d3db4e7fd53c16eac7423172d99e7dd55c9b2a1da4e9
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive URL usage point towards an attempt to redirect users to potentially malicious or deceptive content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.
  • 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://traffnew.ru/aws?utm_term=cartella+clinica+informatizzata+terapia+intensiva PDF link annotation
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/fofosi-libufafev-velubimev-dipapesixuruw.pdfIn PDF document text
    • https://site-1176931.mozfiles.com/files/1176931/47745139895.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fe44a3d51de3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_5fbca6ad6cb10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5fb7175d84714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5fa391058af09.pdfIn PDF document text
    • https://ruloxewetufo.weebly.com/uploads/1/3/1/1/131164393/7017418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473638/normal_5fe93a8b431db.pdfIn PDF document text
    • https://site-1191111.mozfiles.com/files/1191111/dinosaur_simulator_dino_world_crazy_games.pdfIn PDF document text
    • https://site-1084156.mozfiles.com/files/1084156/country_music_radio_station_sacramento.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420612/normal_5fd074a6a2230.pdfIn PDF document text
    • https://lixobanifalito.weebly.com/uploads/1/3/4/4/134443724/lekekosuvoje_zekidazatizowe_duvajunewa_kijewubigukax.pdfIn PDF document text
    • https://kegewibenufugix.weebly.com/uploads/1/3/2/6/132682471/a3ebdb.pdfIn PDF document text
    • https://site-1196795.mozfiles.com/files/1196795/screen_recorder_for_likee_video_call_with_audio.pdfIn PDF document text
    • https://site-1220367.mozfiles.com/files/1220367/78761627483.pdfIn PDF document text
    • https://site-1173352.mozfiles.com/files/1173352/used_high_performance_catamaran_boats_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11301 5176 bytes
SHA-256: 0c8cd98487b993d7424b57fdce96f0eabc07a09605761b1f96db4a1ab9fbfe02
font_01_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 11868 bytes
SHA-256: e7d82f01c7657ef7b83bc8a5852cab36c76d998d035a908656e045d2485fbf5c

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