Malicious PDF — malware analysis report

Static analysis result for SHA-256 861e2554e82bb32d…

MALICIOUS

PDF

88.4 KB Created: 2021-03-02 10:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ad9a4d496d2787229a42f219ff128368 SHA-1: 1bffd568ec4f38808a8d431415c1e7bdce490946 SHA-256: 861e2554e82bb32d17a2d5c6d75465b110bcd8d316ea8c753e64101759485f64
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to known malicious redirectors or disposable hosting. The document body, though heavily obfuscated, appears to contain search terms, suggesting a phishing or scam attempt to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=augustine+confessions+sparknotes+book+7 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4491946/normal_600e9f1f40aae.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/81862937556.pdfIn PDF document text
    • http://xiwogukonefem.iblogger.org/nogerojawivabapeweweweman.pdfIn PDF document text
    • http://bapefajavijofo.66ghz.com/screen_brightness_slider_missing_android.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/b7QWgee/cheats_for_pictoword_level_80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_6021407221148.pdfIn PDF document text
    • http://specrazreshenie.com/73164917602veth9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487200/normal_60230d4461070.pdfIn PDF document text
    • http://domensita.fun/minegajugonomesatelaweh6dvd.pdfIn PDF document text
    • http://digtalcaliper09.xyz/fekotofixezoef997.pdfIn PDF document text
    • http://usesalon.xyz/how_much_do_a_navy_seal_get_paidjewrz.pdfIn PDF document text
    • http://ctyr.ru/wuzopekumipibatefonuwunud2wu97.pdfIn PDF document text
    • http://laulu-go.ru/803036181645z77j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504922/normal_5fd636ea66deb.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
    • http://tuwafexom.epizy.com/53439403824.pdfIn PDF document text
    • http://vowupesagol.epizy.com/66906574959.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_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 5304 bytes
SHA-256: 4c85d3f71b4ff58a99f391303de0709ca1e7584d2dd415b871a12ed3b8613525
font_01_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 10960 bytes
SHA-256: 99b2e4a028f61dbd48b88242a704d4ae00081a7bc5198a0259d9e21d602bcdc2
font_02_sfnt_off00014651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14651 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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