Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f33e1157ceedf0…

MALICIOUS

PDF

76.2 KB Created: 2021-03-19 07:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 906915efe8692d8340022abb7f137de0 SHA-1: 932a2a626c7ef86f4d98c46e15c30b0c77fe1e1a SHA-256: 21f33e1157ceedf07a79aa2265b1dc6559a5ca599c979fa588c1f1fc86ac6ccb
156 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 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
  • 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.
  • 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://crophysi.ru/strik?utm_term=coleman+lay+z+spa+replacement+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380536/normal_60172dc6d0d6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_5ff03f44c717c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_601a6ca7b7e11.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/04e5a6a2.pdfIn PDF document text
    • https://kajuzenutojaso.weebly.com/uploads/1/3/4/6/134631714/sabakazosoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411919/normal_603d5874ec72a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_600a5a7249d6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405193/normal_5ffbfd2ee072d.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/2467316a-7450-47fb-9c92-9a3d48a39c5b/how_did_ancient_greek_democracy_work.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/speak_now_oxford.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe404b04-2a1c-457a-a86c-5785066152ab/battleheart_legacy_2_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/baby_video_songs_free_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cef1c24-1542-4f82-a9b8-675956442a19/22582649213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/511fa656-bef6-49de-a3ca-0f9950eaec9f/99395793102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9840cefd-32fb-49e4-8710-5d4d787a5681/dd_3.5_cleric_tank_build.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/makusizexinatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42494ef1-e397-48e7-90da-00267735b0b6/zepufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e77769c6-8340-4dde-8cd5-efd1a2c7475a/nordictrack_c700_treadmill_motor_belt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa9f416-475b-4a5c-ac23-c041292317f9/little_house_on_the_prairie_season_9_episode_18.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_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 5136 bytes
SHA-256: 0308740619c5a172c3eab1c48392de038df84cdbd6f0007832e49fae029f1a8e
font_01_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 11236 bytes
SHA-256: cf7adf7b32f9dc806a331ba391ae1c05baa1a1a154ce7b4518466c9b1cf3b03e

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