Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e6b4f38ef1100b…

MALICIOUS

PDF

80.7 KB Created: 2021-02-20 08:02:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e05ff5e23e9e1e8ad895c2854f6e8326 SHA-1: beb58687a939f2694ba676038dd657bf98950292 SHA-256: 38e6b4f38ef1100bdc300b560f4097b62ebff2d146a15a6d0b87c7556fd57dba
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file exhibits characteristics of a malicious redirector and link farm, with numerous embedded URLs pointing to external resources. Heuristics indicate a critical finding for malicious redirector links and a large number of external PDF links, suggesting an attempt to manipulate search engine results or lead users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=retire+inspired+book+review In PDF document text
    • http://naturfresh.space/barcelona_team_2018_formationb9gt8.pdfIn PDF document text
    • http://wizalokejova.iblogger.org/51443063385.pdfIn PDF document text
    • http://forsage.pw/nvidia_geforce_fx_5200_driver_windows_7nsra9.pdfIn PDF document text
    • http://josamaduxano.22web.org/wukomaga.pdfIn PDF document text
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/fujirufegidakevavole.pdfIn PDF document text
    • https://pefizisiguxuv.weebly.com/uploads/1/3/1/4/131438819/3449889.pdfIn PDF document text
    • http://shoop-fl.ru/72321050731w9d8o.pdfIn PDF document text
    • http://panijawukufo.iblogger.org/76413419044.pdfIn PDF document text
    • https://vabijerokajesi.weebly.com/uploads/1/3/4/5/134595953/6005183.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gopifu/diesel_t_shirt_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/types_of_analysis_of_variance.pdfIn PDF document text
    • http://nipesuvaz.epizy.com/ff13_upgrade_guide_accessories.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/zidejifutulemul.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/99124911112.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/71080570101.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/funny_riddles_for_whatsapp_with_answers.pdfIn PDF document text
    • http://pikigefunix.epizy.com/android_biometricprompt_support_library.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/evaluation_report_sample_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/unikey_4._2_32_bit.pdfIn PDF document text
    • http://turojupa.epizy.com/catholic_morning_and_evening_prayers.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_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 5076 bytes
SHA-256: 96e8b3d60913092ad0ba0204cb5f18ecc42895afa7de144bbb46620f88ca6864
font_01_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 11056 bytes
SHA-256: 2958678c770dbad19cb1178068046eadd06b806dc010de354fb3604d9742004a

Open this report in the interactive analyzer, or submit your own file for analysis.