Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b4fa558b235b63…

MALICIOUS

PDF

76.2 KB Created: 2021-02-02 07:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2211ab93a6f1487bd9db0e4b8f7fb7ba SHA-1: 9bfa10eda2b3e48f103504df2d15cbdc0406ad47 SHA-256: 86b4fa558b235b63128ea3059bb4d47637ed29a061ec1936ca9c394b9e42aaac
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure, possibly related to a floor plan template, to encourage users to click these links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/aws?utm_term=house+floor+plan+template+printable In PDF document text
    • https://cdn.sqhk.co/nasanoroge/Agge3hc/download_double_dragon_trilogy_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/p8jd6ia/sukesobakapazanadifuzez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489977/normal_5ff41dd36885b.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/tjjggZh/lapejakuwelejuvagalepilow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373779/normal_5feb6887a8a78.pdfIn PDF document text
    • https://ketevifut.weebly.com/uploads/1/3/1/4/131453005/5059265.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411252/normal_5fcf12f2beb9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466413/normal_5fe5d4b0b6b7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_601484d920ef6.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/disol.pdfIn PDF document text
    • https://xowanejizaki.weebly.com/uploads/1/3/1/8/131871556/9897447.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/napoledunadigo/38518555502.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/antonietta_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/83168409814.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/prentice_hall_mathematics_algebra_2_answers.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_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 5148 bytes
SHA-256: 8a15fce3a78019c82fb0d8e9255c1667360fd31e0a8983bcb256c6c7b47d3039
font_01_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 10744 bytes
SHA-256: dca5acb3943e9d68eb924d088e0f191a883cd4085885825fcd786ffb08025a3b

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