Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d17afb2ba6f81ab…

MALICIOUS

PDF

81.7 KB Created: 2021-03-19 18:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b1415d40e6f4bd9bacf5710fda310459 SHA-1: 2337955594921f50f51dd36a929ecdcdee0c29a0 SHA-256: 0d17afb2ba6f81ab3c818afec63b8afe5f4ed2ee3b4ce9667187b812d4395485
186 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. 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 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://zajinet.ru/123?utm_term=apa+format+blog+in+text+citation PDF link annotation
    • https://juniverobov.weebly.com/uploads/1/3/5/3/135317499/b4b8b.pdfIn PDF document text
    • http://contentmedialiteracy.com/15729939667y4cw4.pdfIn PDF document text
    • http://ig-about.net/vudemogisixugijojijs079g.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/adenovirus_konjonktivit.pdfIn PDF document text
    • http://golixudib.mypressonline.com/birds_papaya_ex_husband_jay.pdfIn PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/powos.pdfIn PDF document text
    • http://sks-expertiza.ru/paradise_island_appletonz9eqp.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/54296687262.pdfIn PDF document text
    • https://wuriwodek.weebly.com/uploads/1/3/4/6/134688082/kojikomukoxerat.pdfIn PDF document text
    • https://kilorokininoru.weebly.com/uploads/1/3/4/4/134470368/xujilafosojina.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/orwell_keep_the_aspidistra_flying.pdfIn PDF document text
    • https://naloguvobiwulup.weebly.com/uploads/1/3/1/1/131163976/ruxixob_dikonu_gepujuwo_mizux.pdfIn PDF document text
    • https://wegudogixudefup.weebly.com/uploads/1/3/1/4/131438345/2662418.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/461ebbea-6494-4149-b251-bb8baf66f6df/zifidotesiradijut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6152bd88-6be3-4b98-8aa0-69b7aa2cae09/sodastream_source_element_sparkling_water_machine_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867719e8-ba93-4b34-a885-f2dc1a752c1b/radekiwafozoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4194d9c5-aa25-4c9b-8b44-dd1f85a212bf/polekawanipoxubozozudedav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139afa46-de1a-4e2a-a911-39abe709d554/sekaf.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_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 5144 bytes
SHA-256: a2ddfc337deb16ee79b4045588faff6301320c249188eaa51a7d46eeae698724
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 10648 bytes
SHA-256: 10940f70c19f970f5198d70dab02881fa2deae37bbea67aba02ed7bf903f0ae7
font_02_sfnt_off00012b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B44 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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