Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33628093d013a64…

MALICIOUS

PDF

77.7 KB Created: 2021-03-06 18:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 26e12502274e54ae9b5c5feeed48a71d SHA-1: f370f91aac64a222f8ad9fbc263d279f8c9a23e0 SHA-256: d33628093d013a64e4575d58cea7411ee5d5bae0c2ed1ef3637d45d53e4d4df5
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many pointing to disposable hosting services, and one specifically to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'how to charge g shock solar watches'. This indicates a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/strik?utm_term=how+to+charge+g+shock+solar+watches In PDF document text
    • https://tikiruwilowu.weebly.com/uploads/1/3/1/1/131163793/jibir_gopegofumegiwo.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/vodifet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_6011702546875.pdfIn PDF document text
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/mabobagufasagivake.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/c9c526c80a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_6007043f3aa63.pdfIn PDF document text
    • https://rekilobuviren.weebly.com/uploads/1/3/1/3/131380299/21a5b7ed5095.pdfIn PDF document text
    • https://datotizit.weebly.com/uploads/1/3/4/6/134696706/b06d988.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_603d181d23834.pdfIn PDF document text
    • https://xonaxogurevof.weebly.com/uploads/1/3/1/4/131453171/buzuxujurarus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402949/normal_5ff797f5e3597.pdfIn PDF document text
    • https://vifazadaza.weebly.com/uploads/1/3/4/8/134883600/af15a45395.pdfIn PDF document text
    • https://gutoxokotuvil.weebly.com/uploads/1/3/1/3/131380594/rener.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_5fd750a2aee00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488103/normal_6035a90dcc4db.pdfIn PDF document text
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/mapovabusakenekitamo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gonima/40662028878.pdfIn PDF document text
    • http://baxolorojujore.rf.gd/past_perfect_tense_past_simple_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/90622056009.pdfIn PDF document text
    • http://duzixaludu.rf.gd/65496882973.pdfIn PDF document text
    • http://kurejewupom.rf.gd/60033394526.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_off0000f295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF295 5176 bytes
SHA-256: 09c4a648ad28201de4455d84073a473b1635a83d337cb1907f984de40dd0b01c
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 10852 bytes
SHA-256: 240f6b74f09be2422e08a096c4499ed9194dfd35c6de242aeff9072cc9aacb37