Malicious PDF — malware analysis report

Static analysis result for SHA-256 38873e76994e1027…

MALICIOUS

PDF

84.2 KB Created: 2021-02-26 08:08:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 726bf056b55b0d32c25cd53a62702f8a SHA-1: 8e8647db6a1f2eaa510a2ede33fcb08fc154bf6b SHA-256: 38873e76994e10273d23e280f6c0fb1397bc4ca02a6e1926050232dbc5c0498c
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it is a PDF generated by wkhtmltopdf, and includes a URL that appears to be a lure. The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristic firings point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://maypoin.ru/123?utm_term=best+chemistry+textbook+for+senior+secondary+school PDF link annotation
    • http://lebedugipul.mywebcommunity.org/vabefufa.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/mitsubishi_mr_slim_inverter.pdfIn PDF document text
    • http://norudumof.22web.org/cavite_mutiny_spanish_perspective.pdfIn PDF document text
    • http://watizizilumu.22web.org/gym_program_for_beginners_male_skinny.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/zasopego.pdfIn PDF document text
    • http://paselon.getenjoyment.net/2016_toyota_corolla_ascent_sport_tyre_size.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/92105267318.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/vexeliku/testicular_epidermoid_cyst_case_report.pdfIn PDF document text
    • http://kobinegugagikag.epizy.com/8781812537.pdfIn PDF document text
    • http://xuguriganuzako.epizy.com/gajela.pdfIn PDF document text
    • http://poxelisenaxoxig.epizy.com/star_sports_1_live_tv_apk.pdfIn PDF document text
    • http://suwedafi.epizy.com/69624668190.pdfIn PDF document text
    • http://belibivizonojo.myartsonline.com/lunugifesalakosa.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/sweet_dessert_wine_crossword_answer.pdfIn PDF document text
    • http://dalufiba.rf.gd/bullet_bike_sound.pdfIn PDF document text
    • http://begosene.epizy.com/8540066145.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_off00010a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3B 5684 bytes
SHA-256: f042683c14e23fe43864aa6d0d7a3e2ed930581b639630cc3945599eb3b4fbdf
font_01_sfnt_off00011d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 11472 bytes
SHA-256: 10c29513f0e737c784c09e93c84d92e18357592dfe5d62b3356b932ac7e81612

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