Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ad2390455a85b5…

MALICIOUS

PDF

92.6 KB Created: 2021-04-07 23:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 52556e9b433c21e50a7a3bed971325b7 SHA-1: 25b0450d6a65101a8e4054d7ce0a01b66a0eb9b6 SHA-256: 97ad2390455a85b5259a71a8663e8b4d336146d9366063a8ff31029bf4b812ca
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, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation.

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://gimoguvi.ru/strik?utm_term=sullair+185+repair+manual PDF link annotation
    • https://xapepadoto.weebly.com/uploads/1/3/0/7/130740316/rugoxe.pdfIn PDF document text
    • https://kovexinuzik.weebly.com/uploads/1/3/0/8/130815277/6033703.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/mupesaju-kivamumezaseri-ruwivijomi-jifebaribimiza.pdfIn PDF document text
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/tepenazonit_luzupinepoximew_lureru_porat.pdfIn PDF document text
    • https://cdn.sqhk.co/nokikifabaf/kHzjchc/3d_text_effect_psd_free.pdfIn PDF document text
    • http://wivupivipewezap.mygamesonline.org/75568085043.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/acceptance_and_commitment_therapy_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/eiahge7/bubbu_my_virtual_pet.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/cihAgc5/sculpt_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371261/normal_5fe5b08f2db2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462065/normal_5fcd44d8eea94.pdfIn PDF document text
    • https://mujolimu.weebly.com/uploads/1/3/4/8/134868529/1f671f5f66b0af5.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/hRghbjh/the_last_remnant_remastered_android_walkthrough.pdfIn PDF document text
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/e621fac7b1c76.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/VjcihMD/percentage_uncertainty_calculator_chemistry.pdfIn PDF document text
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/ea61c518894.pdfIn PDF document text
    • https://fevokixesebu.weebly.com/uploads/1/3/0/7/130776230/figofed.pdfIn PDF document text
    • https://xakepimefinawam.weebly.com/uploads/1/3/4/9/134903333/piduwevazub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lixanixuzuki.rf.gd/21865162424.pdfIn PDF document text
    • http://xumutopefar.rf.gd/5522375997.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/sjogren_s_syndrome_pathogenesis.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_off00012a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 5260 bytes
SHA-256: b98ceb1a56f0497c814ea30da11df75f8da7f0edf3e701fe60406bcb373cfbb9
font_01_sfnt_off00013c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4D 12072 bytes
SHA-256: 205c19e60d55aebcfea670e5fee0424139780377a4648d4f008d9cd985a58345