Malicious PDF — malware analysis report

Static analysis result for SHA-256 d375a1e8c76225c5…

MALICIOUS

PDF

85.8 KB Created: 2021-05-14 01:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e6580d1c58c0f9751bbaea9142f6de96 SHA-1: 59c0ebc51bd351100c7b62dcfea7bb76466529ff SHA-256: d375a1e8c76225c5ed5a9df49a9a1d9ad3afd7f4485c638f65e6be574b0d4f6b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://nipisod.ru/strik?utm_term=army+national+guard+drill+pay+chart+2019 PDF link annotation
    • https://kunudixi.weebly.com/uploads/1/3/4/6/134667289/3e5b22.pdfIn PDF document text
    • http://vabetovopux.66ghz.com/new_toyota_camry_2020_malaysia_price.pdfIn PDF document text
    • http://dkblogin-de.best/ralekavupuxoxeravalizazek0j8nq.pdfIn PDF document text
    • http://skidki-day.shop/80670309841s82rr.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/ojcjaHB/femen.pdfIn PDF document text
    • https://cdn.sqhk.co/jawadagive/mSxjbhj/vexar.pdfIn PDF document text
    • http://vsspb.ru/guitar_chord_inversions_drop_2uyc1e.pdfIn PDF document text
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/raluxolosaxuso.pdfIn PDF document text
    • http://usacarins.com/how_to_set_up_my_netvip_wireless_repeatert2azh.pdfIn PDF document text
    • https://pakilimog.weebly.com/uploads/1/3/4/3/134363837/4601518.pdfIn PDF document text
    • http://uspex22.online/18234704935xcsnp.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/OzhbFgg/fimemowoketi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nanabiwilave.epizy.com/candy_manufacturing_process.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/bixapipanuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a3cd36e-537d-4b6e-ae1d-7f5636bb90e6/rojududugazamumizifijosab.pdfIn PDF document text
    • http://godawawisegi.epizy.com/58143248527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b085177b-1c49-4756-8bf4-93bf70b15a7d/daily_oral_language_review_3rd_grade.pdfIn PDF document text
    • http://kafokenenore.rf.gd/96797085570.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/26288018406.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 5884 bytes
SHA-256: d9737e8e0d2ce25ed3b629907fafd3941d8db5d034eff8efb0429b585d5e19ed
font_01_sfnt_off00010c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4B 11544 bytes
SHA-256: 6c39fcf940d35e264c908090cf81950b5fdd629799a550a2497640cff822a0a4
font_02_sfnt_off000133d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D7 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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