Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6cd633f34a4d0b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-19 20:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: afd70dfb2ba1b5cd8690c6d058fc95dd SHA-1: 88edcffa42b66cd922d7ad47823872df6966fb56 SHA-256: fa6cd633f34a4d0b59d97acdd38e8e50ab0496c224c36342ebf43417bf49f27b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains or redirectors, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/123?utm_term=textview+bold+android PDF link annotation
    • https://cdn.sqhk.co/fekerepusa/chchbIN/muraxifowunusetolataxo.pdfIn PDF document text
    • http://sotaredojowiba.iblogger.org/vosovazosapovudizolok.pdfIn PDF document text
    • https://cdn.sqhk.co/fotenulutis/ijcqthb/transgender_surgery_videos_demonstrate_cutting-_edge_techniques.pdfIn PDF document text
    • http://fudasoba.iblogger.org/answer_to_civil_complaint_in_massachusetts.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/453fa657-6a4f-494d-9408-f5a46e5e63ef/fevudirojexijefiseti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cbf8cdb-ff10-4c62-8885-b894677968e3/70316858123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c3c93e0-cdfd-4eb4-a458-aaa4b157de5d/why_isnt_my_phone_connecting_to_ford_sync.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a95a2da-440e-4f09-920f-c4b4452b1dce/boxuxerozojoborus.pdfIn PDF document text
    • http://wetovokerug.epizy.com/brothers_day_malayalam_movie_teaser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5151881b-bb7d-49f6-b748-cc40f959f645/86624015410.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_ba579d1cc3a84639b69336bf9a672b8d.pdf?index=trueIn PDF document text
    • http://zilajib.epizy.com/blitzed_robert_swindells.pdfIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_e486761d3bba4e2c95d7a0e60e30e3ba.pdf?index=trueIn PDF document text
    • http://zimemotom.rf.gd/printable_correcting_sentences_worksheets.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_9d592c236b7049adad691afeb0698081.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a26eefc-e6ee-4ffd-b01f-8f9688910041/37712769119.pdfIn PDF document text
    • http://bupojawepuda.epizy.com/fatazixekarugugajuzavil.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_0fa147a553bb406a94dcb5400390de11.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_e51424e10ec44234a975bc4f21a22ef8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f9ecd0-a343-4282-afcd-167eab781b0d/how_much_does_a_military_police_officer_make_a_year.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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 4952 bytes
SHA-256: 3f6f61b057d22c3c143f8eb51feb1cf6925cc9a41a5314b1c4a2407489322653
font_01_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 11056 bytes
SHA-256: 3027229fcffff14df42af5aa6d24d23f4b874322d87a4e25e672a4361e30ea1e
font_02_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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