Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b3bdef0e75f492…

MALICIOUS

PDF

75.5 KB Created: 2021-03-07 23:13:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ff34385c2a9de5c2a21332515febe26b SHA-1: 0824273e7bb8ef9ebb15ad31182d764df0bc086d SHA-256: 63b3bdef0e75f49286ee8c3d981e5aa164dc98654cdd2366d36157c8d40b2829
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, and ClamAV detection indicates it is a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers'. The presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

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 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://jumiwimov.ru/wix?keyword=beyond+complete+dominance+worksheet+answers PDF link annotation
    • http://lexanizisujufum.66ghz.com/mopedamifekuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_5fd0f0d3814d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464722/normal_5fd749fb3c32d.pdfIn PDF document text
    • http://lyudi23.ru/bifaralabiwezimorisalqvml6.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/23271025949znsxh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426823/normal_601ab9cda3c4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421637/normal_5fe5d252ac30c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483345/normal_5fff39532e7b0.pdfIn PDF document text
    • http://jotodavusugiga.iblogger.org/sing_song_lyrics_ed_sheeran.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/425116f2-d9c6-4709-b665-4c2633a3609c/biblia_en_hebreo_griego_y_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19d4786-c557-4350-89f3-bfbfbd9700c6/55489709010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b581538-fcb3-453d-8499-be67e06f41a4/crockpot_roast_beef_cooking_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46363415-8290-4dba-beba-eff7551800f8/how_to_find_cylindrical_volume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da275366-8267-441b-aa7d-47191fbd76fe/78620796747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a5d708-7a7b-48f0-ae95-a0b9e71c7eeb/do_halogens_have_coloured_vapours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5bcaa1e-f549-43e7-ae26-ebe41fe9a1e2/vesozobagomawopuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/320f9792-60a0-42cd-a25d-4d92c8ad2294/16968770797.pdfIn PDF document text
    • http://nerepigov.rf.gd/blessed_daniel_caesar_piano_sheet_music.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_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 5408 bytes
SHA-256: fad3d4c7b6af047bd7ea81a5012fd6104d7ea23b66ba1be994a475cd76d19c49
font_01_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 10624 bytes
SHA-256: 1b1a5da111e96a23588099d54422bc1f6465b96a5192ea70b194b7bf5ea9485f
font_02_sfnt_off0001129f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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