Malicious PDF — malware analysis report

Static analysis result for SHA-256 743b3ce2078dc643…

MALICIOUS

PDF

63.4 KB Created: 2021-02-12 17:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2ae45607aa71ee1f3b8de3786c73258c SHA-1: 77d4335bbd5b7b1282e50a3ba28279c37d842dcc SHA-256: 743b3ce2078dc643909b31136ce51aec8255518683cbdccfd27f2b3df7888c39
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also returned a high probability of maliciousness. The embedded URLs, such as https://yafferge.ru/wix?keyword=park+ave+school+auburn+maine, are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/wix?keyword=park+ave+school+auburn+maine In PDF document text
    • http://coupons2020.info/pijinaruxovofekesmccuu.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/wuxemogufigud-pepanusevu-fomove.pdfIn PDF document text
    • https://mizijuwewis.weebly.com/uploads/1/3/4/3/134392366/8044f4d6c2d1.pdfIn PDF document text
    • http://texno3ua.com/kassadin_mid_guide_s9rspnr.pdfIn PDF document text
    • https://lifezudo.weebly.com/uploads/1/3/0/7/130739479/071ee37f72876.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/f2jeQN3/33181183539.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/SLGjdih/25439325209.pdfIn PDF document text
    • http://poradoit1.site/free_wallpaper_hd_app_for_androidain8y.pdfIn PDF document text
    • http://iciko.xyz/22432181296ay0mt.pdfIn PDF document text
    • http://peludofnor.fun/xanathar_s_guide_to_everything_druidb2n8i.pdfIn PDF document text
    • https://cdn.sqhk.co/salijuvam/dxAgi9k/33108761746.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://takugiwem.rf.gd/89769657292.pdfIn PDF document text
    • http://jigiwema.epizy.com/editing_marks_guide.pdfIn PDF document text
    • http://wujitotulofok.rf.gd/love_stickers_apk.pdfIn PDF document text
    • http://pasudef.rf.gd/butupalol.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_off0000bc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC96 5304 bytes
SHA-256: 3ba6b47dcd3702361183d300e1d1e0382c3403a5b677c0a784102f0a0542396a
font_01_sfnt_off0000ce81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE81 10032 bytes
SHA-256: 49eb17480cbafa7410a28122af94e956a062a8663f0b77ecc55d686a9969e568

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