Malicious PDF — malware analysis report

Static analysis result for SHA-256 866a2ab1bb20187f…

MALICIOUS

PDF

70.1 KB Created: 2021-03-20 00:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 249d7c94410efe5a69bb4c0654d3a8a6 SHA-1: 41dad59761cf6456becd8fe4d0b8c74487919441 SHA-256: 866a2ab1bb20187f680e19e5eea341a9bf9a1a475037506b1047b549f4b4a3cb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The embedded links suggest a potential for redirecting users to malicious sites or for distributing further payloads.

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://jottigo.ru/wix?keyword=illustrated+guide+to+home+forensic+science+experiments PDF link annotation
    • https://tusaluzope.weebly.com/uploads/1/3/4/3/134374665/2180541.pdfIn PDF document text
    • http://fomigiv.mypressonline.com/5th_grade_math_in_focus_workbook.pdfIn PDF document text
    • https://kofuwirobunugob.weebly.com/uploads/1/3/4/3/134318534/ab12624.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/25101704982.pdfIn PDF document text
    • http://igcopyrightverify.com/birth_of_date_formatwoyc1.pdfIn PDF document text
    • https://kujopupij.weebly.com/uploads/1/3/0/7/130740053/retiwodafof-pisokel-nonolufi.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/arkham_horror_rules_reference5vcsi.pdfIn PDF document text
    • https://volifinidolil.weebly.com/uploads/1/3/0/8/130873876/08f7d019b5007.pdfIn PDF document text
    • http://aycotoro0.xyz/seasons_of_warfare_lady_of_hresvelgc395t.pdfIn PDF document text
    • http://mstmail.space/what_books_are_coming_out_in_20202opsv.pdfIn PDF document text
    • https://kadekorik.weebly.com/uploads/1/3/1/4/131453454/3618421.pdfIn PDF document text
    • https://ninofupefuf.weebly.com/uploads/1/3/1/8/131856131/gubepawezaniw-vinebof.pdfIn PDF document text
    • http://healthit.space/alphabet_template_printable_free5rpaq.pdfIn PDF document text
    • http://nosumiva.mywebcommunity.org/zirubotowupupajafasixa.pdfIn PDF document text
    • http://komarovskii.xyz/digokesikijzyf97.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/0d09b9d9-694a-4af7-b479-d3e8b026569d/what_is_child_focused_activities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2111129-df00-4116-b165-32b70683f00a/63816103863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51657b2-04bc-45da-841c-3874ab088664/the_exorcist_season_3_trailer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2afb64-92c5-4b95-bf8a-50a8e9143b5c/samsung_dmt800rhs_parts_list.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_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 5576 bytes
SHA-256: 16b7383a006ece9b11d6959e9592c827136ea6833ca33ced56160ca0aa2f208f
font_01_sfnt_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 10852 bytes
SHA-256: 80b0d6917d408faf543e5d29e472f79f92c5f74a72955637432ca2ae1e4ca89c

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