Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f35fc96a5a53a55…

MALICIOUS

PDF

81.6 KB Created: 2021-05-10 08:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03191497eec24ffd446de58b9e3fb944 SHA-1: 578dc061681e9669852bc9892f939cb57b0a3e8b SHA-256: 4f35fc96a5a53a553fdceb8e23b85267e19a76c4634da403426220952eaf9fa2
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or distribute further payloads. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

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 http://tomolijoponix.mypressonline.com/58173762279.pdf In PDF document text
    • http://pexawegowe.mywebcommunity.org/turbo_chameleon_64_wiki.pdfIn PDF document text
    • https://nudabubi.weebly.com/uploads/1/3/4/3/134323665/kirofewapobuba.pdfIn PDF document text
    • https://cdn.sqhk.co/lilajibusizu/Gl1gfrV/birunadokivakejaguxapow.pdfIn PDF document text
    • https://tuvonozesafuk.weebly.com/uploads/1/3/4/6/134600303/deruloraj_pobugewaripab_temaliven.pdfIn PDF document text
    • https://cdn.sqhk.co/vonewesipan/gi5jgzp/gopixa.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/5401094.pdfIn PDF document text
    • https://rorefodelubo.weebly.com/uploads/1/3/1/4/131452934/koged_vabalaliv_kafeboforaj_fadibuxo.pdfIn PDF document text
    • https://lijasefevofik.weebly.com/uploads/1/3/4/8/134889997/f69fc15305c91.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/50145787134.pdfIn PDF document text
    • https://kisewosa.weebly.com/uploads/1/3/1/0/131070890/fijibe_viguman_kujagarasepo_wofogi.pdfIn PDF document text
    • https://xizulorojude.weebly.com/uploads/1/3/5/3/135391297/8624599.pdfIn PDF document text
    • https://kusagurapatavo.weebly.com/uploads/1/3/1/8/131871515/lalitoxejonizoxovan.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/bihO0ol/guitar_tone_sounds_muffled.pdfIn PDF document text
    • https://kawepuwaseleza.weebly.com/uploads/1/3/4/8/134849925/xavinesom.pdfIn PDF document text
    • https://kewetarutedur.weebly.com/uploads/1/3/0/9/130968996/8105261.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
    • http://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=summary%20around%20the%20world%20in%2080%20days%20ch%2010PDF link annotation
    • http://kabumutudera.epizy.com/gastroenteritis_akut_idai.pdfIn PDF document text
    • http://fukokisofor.epizy.com/reduce_mac_os.pdfIn PDF document text
    • http://bufolezipozazom.epizy.com/national_lottery_funding_application_form_2020.pdfIn PDF document text
    • http://vaguxupinirulop.epizy.com/9165152252.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_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 5748 bytes
SHA-256: 4c1be33d26cf8454a3f442c3f60851264c9e10466d518992b6fbef577a5ede54
font_01_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 10744 bytes
SHA-256: 92ce5f0c3d4125c0c2bccf1333975229efa2215cc010bc525bf70433a607f0ce
font_02_sfnt_off00012b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B06 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f