Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e49658ee73890c…

MALICIOUS

PDF

79.8 KB Created: 2021-05-29 10:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3ab650aa1f331b313d3ac9f5274035ff SHA-1: d5dd461850ec7aa94beb3e547c138747e62a55c4 SHA-256: a7e49658ee73890c45a98a150f59c5bfb4cca1171ef8c3987921d98ceb888865
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 or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=what+age+does+wendy%2527s+start+hiring', are likely used to redirect users to malicious content or phishing sites.

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
  • 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://zajinet.ru/strik?utm_term=what+age+does+wendy%2527s+start+hiring PDF link annotation
    • https://tobopitoru.weebly.com/uploads/1/3/4/8/134872655/766ff40.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/duzusomuwo.pdfIn PDF document text
    • https://wusukinepazewa.weebly.com/uploads/1/3/4/3/134372908/99a8a1af094a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488090/normal_6058a3332a496.pdfIn PDF document text
    • https://sekotujuf.weebly.com/uploads/1/3/5/9/135960234/jenoz-muzobes-betenudevisitip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451356/normal_6007b560f2089.pdfIn PDF document text
    • https://fejenugid.weebly.com/uploads/1/3/4/0/134016750/xivutesopanu.pdfIn PDF document text
    • https://namukizup.weebly.com/uploads/1/3/4/7/134748015/nifezafuwolil_kenoz_rabuji.pdfIn PDF document text
    • https://vumamoxaku.weebly.com/uploads/1/3/1/3/131380777/414482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_60176b6042af6.pdfIn PDF document text
    • https://palotuzumi.weebly.com/uploads/1/3/5/9/135991270/tetanakivuronixix.pdfIn PDF document text
    • https://mebawepuxir.weebly.com/uploads/1/3/4/5/134525212/2824322.pdfIn PDF document text
    • https://kakulekatorud.weebly.com/uploads/1/3/4/6/134681497/e796d57fbabb7.pdfIn PDF document text
    • https://kileligujet.weebly.com/uploads/1/3/4/4/134457719/xunosigeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423757/normal_60609a3067d0c.pdfIn PDF document text
    • https://jibefurerir.weebly.com/uploads/1/3/4/9/134902303/9057bc33b0d.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/8904105.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
    • https://uploads.strikinglycdn.com/files/9e48ac30-2efe-4164-9cb2-789d8abd6649/gofewaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aba58f91-08a1-492a-95e4-54624680bcdc/bugotifepuwusu.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_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 5084 bytes
SHA-256: b3ce78a3e15dd874312f28c54b7c1ae3cbc41afd0434befd85d6cbf12825e0c2
font_01_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 11120 bytes
SHA-256: 589c2fb0daac075968760ff978949b8681683eaafe35751a570026c332578ab3
font_02_sfnt_off0001222b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3