Malicious PDF — malware analysis report

Static analysis result for SHA-256 897b1fcfe52ed3f4…

MALICIOUS

PDF

68.4 KB Created: 2021-03-18 05:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 692c9ef5524248fecfb2b24736afe543 SHA-1: c68e7d9fc0f5b216f64c233cee98bd24de2d3939 SHA-256: 897b1fcfe52ed3f41df69c0ac0c8bfab40e5767367941c01fa651e6232a3d258
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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 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.
  • 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://golowaki.ru/123?utm_term=brain+teaser+worksheet PDF link annotation
    • https://biwazasidatuf.weebly.com/uploads/1/3/4/3/134373857/tipoxaganudera.pdfIn PDF document text
    • http://baltika-trans.ru/augustan_agefvdtr.pdfIn PDF document text
    • http://fuxakuzaporelu.iblogger.org/chemical_pathology_mcq.pdfIn PDF document text
    • https://xizevidunofi.weebly.com/uploads/1/3/4/3/134321119/3c2dfe6.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/787799.pdfIn PDF document text
    • http://community-day.ru/bivupuvizunethst4e.pdfIn PDF document text
    • http://arevakar-travel.com/jogikeladekarisatobatot0dioj.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/luwiloniw-mojumokebolufub-mixote.pdfIn PDF document text
    • http://strita.space/adivasi_timli_song_videohm1ep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_e0e857086f7a4947a525ef060e4e604b.pdf?index=trueIn PDF document text
    • http://jolenifetonami.epizy.com/cartoon_network_coloring_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/fb_messenger_apk_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/zikazafavudoxemi.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/xmanager_passive_free.pdfIn PDF document text
    • http://tawoxigedokewu.rf.gd/layers_of_the_earth_worksheet_free.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_2fc98b6c66774b4d9a91a2e64882c883.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/nemez.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_07872eb1b9b04b7495ec9b612732c48e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/fenepanazolozix.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_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 4948 bytes
SHA-256: 0dbe9839135461b789f3d0d579ebb6f83416206ebd367045a9074c1746f04d5b
font_01_sfnt_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 10372 bytes
SHA-256: cc0c2cbf229370b3c96820262f882ce8fa86cd437978845af21389009e87a8db

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