Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3971473b007044…

MALICIOUS

PDF

63.3 KB Created: 2020-11-19 03:05:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5c1023a73342958ff3f523c4f564b5c8 SHA-1: 15bfcb5b095b94c5ca1127dd01344b173a82787d SHA-256: 0b3971473b0070449a4b12a86aa803a574bd3b7e4ccfdebaff1331f84f8a2281
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, alongside numerous other embedded links suggestive of a link farm or phishing campaign. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffking.ru/strik?utm_term=footloose+2011+movie+free In PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/1575407.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/e237123bd83602c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5f9e874b25ec3.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/sivotoluv.pdfIn PDF document text
    • https://sixexarujizevav.weebly.com/uploads/1/3/4/5/134584368/zowajazedosi-lirof-kotatonekajin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5f924d4d7c7f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_5f8dab485b783.pdfIn PDF document text
    • https://xinujulajupi.weebly.com/uploads/1/3/4/3/134321003/fd1fbad5e26bd.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/affb7a1f-cdc0-43bc-a9d3-30d287c89b6d/flying_pig_lab_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fceecaf-9bf7-471f-a5d4-53b4e31310c0/list_of_high_schools_in_kingston_jamaica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/108a8f72-ab0c-48f5-b323-83b70e3f052f/lotuwesumupew.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_off0000ae7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7C 4728 bytes
SHA-256: 15ac81b23e15834adc8af5b10335c81c4363812c3ac00262753560001889c217
font_01_sfnt_off0000be9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9C 10596 bytes
SHA-256: c4fac5941b85fd138ec18c6cddf0f4fe5e8602e2493b809ae646d2470f29d1ce
font_02_sfnt_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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