Malicious PDF — malware analysis report

Static analysis result for SHA-256 893c299bee0b295e…

MALICIOUS

PDF

70.8 KB Created: 2020-12-11 05:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3d8ca98a5da5bc151f8fc3b407b01db8 SHA-1: 680d636aa7791a1d51a478f94f19c68c93275b44 SHA-256: 893c299bee0b295e4a6306f91bb8c2ac4053bfdc82910a0e610ef607f1494ff7
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a malicious redirector and part of a link farm. The ClamAV detection and ML classifier further confirm its malicious nature. The primary goal appears to be directing users to potentially harmful external sites, likely for phishing or malware delivery, masquerading as legitimate content.

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 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://ggtraff.ru/strik?utm_term=codingbat+answers+warmup+1 In PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/xujewonagamaxu.pdfIn PDF document text
    • https://jajedasas.weebly.com/uploads/1/3/4/2/134234666/xudanan.pdfIn PDF document text
    • https://sibolapitabake.weebly.com/uploads/1/3/4/4/134469628/xonuzumugisobubi.pdfIn PDF document text
    • https://mumixiginuwogi.weebly.com/uploads/1/3/4/7/134752923/7779638.pdfIn PDF document text
    • https://palidabelegofa.weebly.com/uploads/1/3/4/3/134316445/suzuzemogavavozojiti.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/68942de5-c879-48f7-81ea-143e4da9937a/a_midsummer_night_s_dream_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dd271f2-fbb2-4846-9c5c-f76597780338/how_to_wash_shutterfly_fleece_blanket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b9597d-b091-4f5a-b853-c58a7e97fcf1/66785726766.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/latter_rain_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7376ad2a-d2dc-44bb-a2d0-9cdb4841545e/naduzabejisotuzisike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626f2013-6b0b-4337-9bd3-6193683af473/tarevirep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a33e94-cca9-43d0-a3ad-1f816838e895/embed_google_calendar_without_iframe.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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 5436 bytes
SHA-256: ae3d37b836d58a563c1aa7e7f2280a9b0d62e4f642383ec54d013f752ef86e26
font_01_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 10892 bytes
SHA-256: 52e39074e890aedb400732a2b15b5566e117e95e553c6c5c2c71cefe8af252df

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