Malicious PDF — malware analysis report

Static analysis result for SHA-256 038d06558844eb07…

MALICIOUS

PDF

82.3 KB Created: 2021-06-05 17:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bd4e90a5e6c082d40b3369f1ebc5acbf SHA-1: dffc2d2c616b1c147cb593408b7cf648b3cb53ae SHA-256: 038d06558844eb07d4550f6b502088dea41823b63c1da3a0caa512b54398b4e8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/123?utm_term=common+behavioral+interview+questions+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420244/normal_600b67315207e.pdfIn PDF document text
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/c30869e00c8b.pdfIn PDF document text
    • https://mefifusefom.weebly.com/uploads/1/3/4/2/134266023/xoneruda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449422/normal_601dcfabd6349.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/6983862.pdfIn PDF document text
    • https://kuratiwupojaxu.weebly.com/uploads/1/3/4/0/134017491/9ca48665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_604dea16e68c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473023/normal_6008d0528eeb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483335/normal_6068cd62712c1.pdfIn PDF document text
    • https://durabikat.weebly.com/uploads/1/3/4/5/134512276/14622adb4713e.pdfIn PDF document text
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/vasizivaje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aa743da-618d-4d57-80e8-495d3067b9e3/fekaxejipazibafomitufuv.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/music_theory_exams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/414525a9-7d74-4eb9-9ede-f5bf95e600e3/daily_use_vocabulary_words_with_hindi_meaning.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144413889/what_is_code_of_conduct_in_business_ethics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8bd564-1822-4ff8-b8f0-09a60b586a22/easy_touch_glucose_meter_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e67f7922-8647-4d0d-a93c-72892bec62b6/10767339475.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_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 5248 bytes
SHA-256: df1927ea1ccc5e6a442f57fc22ddecb960cece26d382319ee193cf47ee091237
font_01_sfnt_off000116d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 10756 bytes
SHA-256: ff6075ba2e8eb2c825cfa55c97f64da12e503eaedb8d533c4dd29511d1306151

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