Malicious PDF — malware analysis report

Static analysis result for SHA-256 800bda92363f596f…

MALICIOUS

PDF

74.7 KB Created: 2021-02-22 13:07:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 246192d93e3dcc933741c3fd68818cb8 SHA-1: baf2cc4196cd7097d3e1a2f881ccdb4757c57e0e SHA-256: 800bda92363f596ff5b5cd444e7eeb0dbde8241f17829d805d6af77977cb635b
224 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and suspicious domains. The ML classifier and ClamAV detection strongly suggest maliciousness. The embedded links, such as http://loginwithfb.site/xutolexonorefoposupo1st.pdf, are likely used to redirect users to phishing sites or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://crophysi.ru/123?utm_term=mary+poppins+supercalifragilisticexpialidocious+lyrics+english In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd61ee70d6d0.pdfIn PDF document text
    • https://konomotawet.weebly.com/uploads/1/3/1/3/131379362/tanakituriru.pdfIn PDF document text
    • http://doctora.club/systemverilog_function_return_dynamic_array2hj9m.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/36d7eff3d1cc3.pdfIn PDF document text
    • http://nuverlites.online/centroid_theorem_worksheet17wud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_602c862cc18e1.pdfIn PDF document text
    • http://edarudost.online/army_ccir_reportd4bxr.pdfIn PDF document text
    • http://loginwithfb.site/xutolexonorefoposupo1st.pdfIn PDF document text
    • http://republvinb.fun/canada_s_food_guide_servings_for_adultsgzhh3.pdfIn PDF document text
    • http://cardio-natural.info/telugu_ringtones_2019_naa_songs5fmr2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366947/normal_5feb79e97f094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450353/normal_601ec982a4f73.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://dasutako.rf.gd/bejeweled_3_app_for_android.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_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 5472 bytes
SHA-256: 1bd2272206e83e4db03f032d08fb0ad1a8326e3104d8454aa210067a53798d99
font_01_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 11056 bytes
SHA-256: 2f2e6af1b0e02b6cddc23fad53ef45855bb201bce37340d9ee555e0c5e256d5e
font_02_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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