Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55f4ae3b4022690…

MALICIOUS

PDF

104.1 KB Created: 2021-06-05 10:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d64000987d6d256af8129abc6245816d SHA-1: e92f81e5cc0f066aed62c6d5c306c168dc8a27d4 SHA-256: f55f4ae3b40226908cc609f69472be404b0dcbcab6edf0ceece013c1d71d3664
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary URL, 'https://allytemp.ru/pbw?utm_term=hec+ehsaas+program+apply+online', is presented as a lure for an online program application. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://allytemp.ru/pbw?utm_term=hec+ehsaas+program+apply+online PDF link annotation
    • https://jinokafolamod.weebly.com/uploads/1/3/4/3/134310646/2390038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_601a0d59e1f41.pdfIn PDF document text
    • https://nuxinipimop.weebly.com/uploads/1/3/2/6/132682773/656e2fe32251.pdfIn PDF document text
    • https://pupizotewijuguw.weebly.com/uploads/1/3/0/7/130775862/lubelesef_dikufavezejepex_zekev_tamaruk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_6040666fa2536.pdfIn PDF document text
    • https://nexolibevi.weebly.com/uploads/1/3/4/4/134463206/66763.pdfIn PDF document text
    • https://fuxogadukuka.weebly.com/uploads/1/3/4/6/134688721/fosomivamoxud.pdfIn PDF document text
    • https://sakeneri.weebly.com/uploads/1/3/4/3/134339958/5183509.pdfIn PDF document text
    • https://zipuboxovasabe.weebly.com/uploads/1/3/1/4/131483293/nilufejisewetox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478961/normal_5fd08011c31f2.pdfIn PDF document text
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/fekosago-xasizigunevix-xinavovilo.pdfIn PDF document text
    • https://tuzitumup.weebly.com/uploads/1/3/4/3/134385826/9122129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_605127d8d768a.pdfIn PDF document text
    • https://bovabesizepin.weebly.com/uploads/1/3/1/3/131383515/3473999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_605d7d311c445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e18a1d-c533-4f41-8fed-e38a6ceb3e0b/boxupadufuwogavaj.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/f/how_to_cook_a_smithfield_spiral_ham_with_glaze.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/f/85178203168.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a9ae89-f906-4a16-8a1d-47119a96e1e0/como_hacer_una_propuesta_de_valor_ejemplos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd67ded-0f12-47c7-a0e1-206efcdd6582/design_thinking_stanford_coursera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b71b7aa-f57b-4780-ac32-d78c82a1b3cf/the_power_of_love_celine_dion_wiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53eb0bcc-7a75-4a91-b8c6-8ff01b75f84d/what_instrument_is_used_to_measure_weather.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_off00015b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B00 5412 bytes
SHA-256: 121027f8ecffbd0e6c7fb037d2bdcef2163aa80723f47886383a6ff5b5ee94eb
font_01_sfnt_off00016d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D47 11052 bytes
SHA-256: 8abed15fac0cd9fc289fd1d7e4605125588341982faf7a1f57cfc7c72ffa34e2