Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48e18dd59909761…

MALICIOUS

PDF

78.4 KB Created: 2021-03-12 18:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a91b037592c4ce8abcc846818616f5cc SHA-1: 4e667cdc13b473e95325927b7d60947f962ab441 SHA-256: d48e18dd599097618fe05a7799bb5bf6afd71c87428342c8fd8b868b0df201ca
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to potentially malicious redirectors or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to employment attestations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=attestation+employeur+pole+emploi+pdf+2020 In PDF document text
    • http://moneymaya.site/fitepewagizuviwakodagoka612ql.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/toboliviwudatogo.pdfIn PDF document text
    • http://life-news.tech/widiferexogekjoji.pdfIn PDF document text
    • http://nejenowavofol.22web.org/28789689967.pdfIn PDF document text
    • http://azorocheat1.xyz/953076136966sw2j.pdfIn PDF document text
    • http://geleostone.online/lemamedagujuxfkmch.pdfIn PDF document text
    • http://discount50it.pro/205967367880v7lm.pdfIn PDF document text
    • http://prizinsta365.online/costco_panasonic_phones_reviewg6g4n.pdfIn PDF document text
    • http://liko-sneakers.com/jolly_phonics_grammar_handbook_3tg0hb.pdfIn PDF document text
    • http://dress-russia.ru/rodos_heykeli_ingilizce_tantm8thiz.pdfIn PDF document text
    • https://rezisepadas.weebly.com/uploads/1/3/4/2/134235668/mufavixonopako_lobufitas_gotob_dafelelunorotij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_2b3e474d2bab42c693f869f64d71f3fa.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_167a5e75548447bc9fb2b858977f6560.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_82f13d7775904070a08bd2956db59fc8.pdf?index=trueIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_a341424ce2ee43e78878b180ec68b7af.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_5151a090ecf64ee9b3602a8931a5792b.pdf?index=trueIn PDF document text
    • http://jugozuzojo.rf.gd/29719116323.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_266ca23f4dae4e088d00ae34e623f525.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_d2351d2e30c94b96aaafc064f5679566.pdf?index=trueIn PDF document text
    • http://biwoxurovoke.rf.gd/41870857803.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_off0000ec25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC25 5552 bytes
SHA-256: 31bc16aca17b0b717943bf848bbbe20bc929e3713fe5caa1bfbf7071a1f22f86
font_01_sfnt_off0000feee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEE 2212 bytes
SHA-256: 74b0f7db8d521f0ba138b1f7682b8c56bc480b077482435ba61c3944a6315d24
font_02_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 10196 bytes
SHA-256: 571e01eba7606bc66fc986f8cfbe73333f3188593f243cdc3067dd01be19c814