Malicious PDF — malware analysis report

Static analysis result for SHA-256 3721572788f5c929…

MALICIOUS

PDF

79.9 KB Created: 2021-06-08 09:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: ccd200644f5b14c8890d2092cb9caf18 SHA-1: 804bb42b07deb79aa66b96ce3c327727b9785182 SHA-256: 3721572788f5c929661ed9fb5cce208fa1e7d786e95f839fbd6276cf17845633
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing lure. The document body, though heavily obfuscated, contains text related to job interviews, likely serving as a pretext to encourage users to click on malicious links.

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
  • 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://queure.ru/pbw?utm_term=how+to+introduce+my+self+in+job+interview+pdf PDF link annotation
    • https://xiwiriled.weebly.com/uploads/1/3/4/8/134899872/kozepadavani_jarelomoxu_tigumezobo_kerojala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_6064c0dbbdd34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448550/normal_5fd04e6352665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426271/normal_5ff6354ef3d7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464301/normal_5ffa7d8c80c64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_60373538d48a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412391/normal_601ec6d6e1c20.pdfIn PDF document text
    • https://nugiwilog.weebly.com/uploads/1/3/1/3/131384260/7833567.pdfIn PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/fegesopugexadi.pdfIn PDF document text
    • https://powipawi.weebly.com/uploads/1/3/4/3/134313445/tireni_zarul.pdfIn PDF document text
    • https://titugujogimob.weebly.com/uploads/1/3/4/0/134017720/306143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_601b61e83d47c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470968/normal_5ff3bff9e9bf0.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://uploads.strikinglycdn.com/files/9d513a49-5e75-43a3-9356-611936f6bdf3/how_to_turn_off_lid_lock_on_amana_washer.pdfIn PDF document text
    • http://betifabito.pbworks.com/f/byp_8-_11_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564bc98e-3bd0-441e-94fa-f2625292476d/how_to_calculate_cross_sectional_area_of_stranded_wire.pdfIn PDF document text
    • http://rekadezabo.pbworks.com/f/beeman_sportsman_rs2_series.pdfIn PDF document text
    • http://goxuluk.pbworks.com/f/food_vocabulary_list_in_english_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b1837d-5e35-49f2-9360-fb2292d29b12/wodifevimisajotoxevasuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc8d7a7-dc03-4934-8bab-cc37cbf7b8fb/susan_sontag_against_interpretation_table_of_contents.pdfIn PDF document text
    • http://magogopowo.pbworks.com/w/file/fetch/144478503/86547691666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17bd5375-d2aa-453c-ae21-9b432ef2db78/what_is_the_responsibilities_of_a_logistics_or_distribution_manager.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_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 5404 bytes
SHA-256: 14ac4a73b768b0ea9346df4d2e9c210db075e9b791b897f0e6d48c799d422da1
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 10784 bytes
SHA-256: d01aa8091a43879829e4ca8c9352d6a583268a3f9b813e60e94cd0fafdfd4e87
font_02_sfnt_off00012399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c