Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd7d1da928801f4…

MALICIOUS

PDF

84.2 KB Created: 2021-03-21 23:21:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5397dd15aa8683acbeb2cb27f384a99 SHA-1: 9f7413af7df1897b12fdfa7c26e7be2a067261fa SHA-256: cfd7d1da928801f4ca96eec1265059000d82dcb45c76be295f13e29687caed32
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant number pointing to external resources, including a large link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though partially obfuscated, suggests a lure related to 'worksheet answers', aiming to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=impulse+worksheet+answers+3.1
    • https://damajarulapo.weebly.com/uploads/1/3/0/7/130738748/1712825.pdf
    • http://fb-ig-violation.com/vawelivaguex3s.pdf
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/zovuluxoja.pdf
    • http://8gusevshop.website/203248304939n2uz.pdf
    • https://zexejofamimow.weebly.com/uploads/1/3/1/4/131438337/tazekejunuleno.pdf
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/sivujujob.pdf
    • http://ses-sanobrabotka.ru/short_guide_to_writing_about_biology_8th_edition_freewy5me.pdf
    • http://idealslimitalia-ufficiale.site/criminal_case_full_hile_apki4aai.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/webipejonavuv/watetubaw.pdf
    • https://s3.amazonaws.com/muvemasoxaji/8232714550.pdf
    • https://s3.amazonaws.com/davolazupivowi/flipkart_online_shopping_double_bed_sheet.pdf
    • https://s3.amazonaws.com/jamuluvuvava/problemas_en_mexico_politicos.pdf
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_cb04236f4c0643dfaa680860366d5857.pdf?index=true
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_ccf484794643487a9f7e9505fd099b9f.pdf?index=true
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_4838306c77b34adba5b502a904fce398.pdf?index=true
    • https://s3.amazonaws.com/ronenitevodo/sasigaworam.pdf
    • https://s3.amazonaws.com/tinezedu/oxford_english_grammar_course_book.pdf
    • https://s3.amazonaws.com/xewamejixolefaj/android_gps_module_app.pdf
    • https://s3.amazonaws.com/jagux/affine_space.pdf
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_30751e190aa8430a8e0f2719b3692bee.pdf?index=true
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_e732d774210c4a7394aca1b668a610c2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a4.bin
6498fec2bf936cf1187ac5598f962a76e4924bcb2bf06cb9b229c30988df051f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 5400 bytes
font_01_sfnt_off000108ef.bin
6c3cd4229f069347caebc279f88ac3924a9c0ba90e66229d408ad0db484ab8af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 10760 bytes
font_02_sfnt_off00012e24.bin
b10e7a0583bf6b216a5471aeed10f14210f1dda3adb60ac5169fcb38ba12e60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E24 16060 bytes

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