Malicious PDF — malware analysis report

Static analysis result for SHA-256 d273848aa71d2d67…

MALICIOUS

PDF

78.5 KB Created: 2021-03-23 01:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4f4750b66b00727645956ae558041d08 SHA-1: ac82d15f1e419bea36809e07ab7c0fc840f3445d SHA-256: d273848aa71d2d67ee3ac9f6a7390c1a5138ec085274df47d7b690570e33db56
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The embedded URLs, such as 'https://fokemale.ru/aws?utm_term=samsung+un40h5003af+smart+tv', suggest a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/aws?utm_term=samsung+un40h5003af+smart+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417534/normal_602bf7ef7c8d6.pdfIn PDF document text
    • http://alphabitx.com/378915606911i1tk.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/sniper_data_book.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/tusitesowa.pdfIn PDF document text
    • http://wiinorama.website/chote_raja_songjvvah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484107/normal_603c199eb00c9.pdfIn PDF document text
    • http://dragonflysagewellness.com/wusotepejomexamog3ld3z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_602399804a6dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485454/normal_603caa33ae43a.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/les_miserables_2019_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374853/normal_602b6fe2e92b3.pdfIn PDF document text
    • http://xeeewq.xyz/roku_2_xd_manual7ek3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5fc7dab5c4e0b.pdfIn PDF document text
    • http://leadtop.co/fokavusanesuxolwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463565/normal_602cf239381c6.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/dorobukasawituw/45200327408.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/ant_video_er_for_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/count_and_write_worksheets_for_grade_1.pdfIn PDF document text
    • http://jolavewavesuj.epizy.com/free_math_worksheets_adding_and_subtracting_fractions.pdfIn PDF document text
    • http://tobesonev.rf.gd/rabituliwobube.pdfIn PDF document text
    • http://todifisafi.atwebpages.com/lofipurejelaxip.pdfIn PDF document text
    • http://xirexadugimog.atwebpages.com/7325543029.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_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 5832 bytes
SHA-256: c32bd327af991615478e398e0b52237630a4ee645443e038438006c77fb05d6b
font_01_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 10628 bytes
SHA-256: 874678628dc89688e6a14288c9258e9b6b4080fb43522923c6ee8aad37a1b1cf

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