Malicious PDF — malware analysis report

Static analysis result for SHA-256 4392e8963fae3296…

MALICIOUS

PDF

89.2 KB Created: 2021-06-06 23:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8e27068da6965678c287f90f517eaf52 SHA-1: 25e896bf9cbf49c7ae25c90fad662dab2395839b SHA-256: 4392e8963fae3296eea99911f535e56ba8dc9a9989c7a5e34b86b562d0711dd2
206 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. It uses a QR-code lure. 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 0.9990

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://maypoin.ru/123?utm_term=three+digit+addition+with+regrouping+worksheets+free PDF link annotation
    • https://jumopafebog.weebly.com/uploads/1/3/4/5/134504074/1403183.pdfIn PDF document text
    • https://kajukijuxuvame.weebly.com/uploads/1/3/5/3/135329863/belafotuliga_damarobiket.pdfIn PDF document text
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/gakesevefu.pdfIn PDF document text
    • https://kovovovugatu.weebly.com/uploads/1/3/4/5/134599685/3cf633c8cee.pdfIn PDF document text
    • https://futemagavixen.weebly.com/uploads/1/3/7/5/137501346/1c5166e55cb5.pdfIn PDF document text
    • https://gosaronazaniga.weebly.com/uploads/1/3/4/8/134851605/durebakujovesiram.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/lovikizi-tosuloduw-zirina-koguper.pdfIn PDF document text
    • https://kidenido.weebly.com/uploads/1/3/1/6/131636891/tejugidazurakili.pdfIn PDF document text
    • https://guvisine.weebly.com/uploads/1/3/4/5/134598756/9065018.pdfIn PDF document text
    • https://xasananixekoweg.weebly.com/uploads/1/3/4/4/134442195/zurokug.pdfIn PDF document text
    • https://gizepigonezes.weebly.com/uploads/1/3/4/9/134901759/100429deaf95.pdfIn PDF document text
    • https://bimidofun.weebly.com/uploads/1/3/4/4/134460432/b184d141443.pdfIn PDF document text
    • https://boxotajisosuni.weebly.com/uploads/1/3/6/0/136086252/mider-xulurof.pdfIn PDF document text
    • https://xonidaxu.weebly.com/uploads/1/3/4/3/134319292/419d0c87293fdd1.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/71067727-195c-4c77-a232-a0809f374db1/57692694851.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144665559/96788603896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20e07f14-5229-4bab-b9e3-14d3237917c8/jebipotedidasurunoloval.pdfIn PDF document text
    • http://bokibagaror.pbworks.com/w/file/fetch/144666330/un_kilometro_cuantos_centimetros_tiene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12eb62cf-36a3-41a5-b598-e340c74628fb/25783196925.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/how_do_you_hack_leap_day.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a2c77cc-99ce-46dc-acb9-f7db7b0213b2/free_high_school_transcript_template_homeschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc3b6b8-23c8-4b60-a797-1680a92dde4a/why_is_crackle_so_bad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf89d7af-4e61-4eaf-8c56-7c9dd19bd1ad/xewusikefa.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_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 5256 bytes
SHA-256: 9b0941e96f095c3515b6100dba8f7b8b7f0e53d93f442b1294730fb6514de1be
font_01_sfnt_off0001227a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227A 11380 bytes
SHA-256: f7187eb932730ac616730fab7c27b2137cb7ce220a0fd5a55f4660f4221363ea
font_02_sfnt_off000148cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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