Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff0a1a9c69eb947…

MALICIOUS

PDF

76.3 KB Created: 2021-03-25 03:03:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 880d8a98b08ee176e1a2d8354cd5d41e SHA-1: 8d133261357fe9ca5e03c836d46604f794fbe2fa SHA-256: 1ff0a1a9c69eb94771c4dc10d85cada5f778a8c0178f09ef2f3c8fc190a6c575
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous external links, suggesting it is part of a link farm or attempts to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards an attempt to deceive users into clicking malicious links, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9324

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://pelibifir.ru/award?keyword=tut+admission+form+2020+pdf
    • https://static.s123-cdn-static.com/uploads/4412758/normal_5ff17f6864a2a.pdf
    • http://mitimewigupito.mypressonline.com/dbt_distress_tolerance_handouts.pdf
    • https://cdn.sqhk.co/dasadogiso/gdjahgi/8020384524.pdf
    • https://cdn.sqhk.co/sozodumupof/ahZfggF/azamara_cruises_journey_reviews.pdf
    • https://cdn-cms.f-static.net/uploads/4369166/normal_603455871e815.pdf
    • https://static.s123-cdn-static.com/uploads/4471692/normal_60088d37d504c.pdf
    • https://cdn.sqhk.co/papebikuwi/4xhfjdj/face_melter_spaceland_guide.pdf
    • http://wofurasosezisax.mywebcommunity.org/mapejiro.pdf
    • http://wasatosu.sportsontheweb.net/albert_beveridge_the_march_of_the_flag.pdf
    • http://xufamorazogubov.sportsontheweb.net/the_5_love_languages_book_by_gary_chapman.pdf
    • http://xifadezuzurap.medianewsonline.com/inception_screenplay_book.pdf
    • https://cdn.sqhk.co/banuluwopote/icgegdf/ios_store_app_intune.pdf
    • https://cdn.sqhk.co/mowasikuso/q8m3hgj/31897729017.pdf
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fddd0c90151b.pdf
    • https://cdn.sqhk.co/rarukaboz/igMiaja/wimotefa.pdf
    • https://cdn-cms.f-static.net/uploads/4407664/normal_6027bd7659a7d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_27fe7ffa3a9e43689939b5ae2a29dd26.pdf?index=true
    • https://s3.amazonaws.com/jezobasit/bts_make_it_right_video_mp4.pdf
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_3cbf1ed87d1e44999c837a891db9c1ba.pdf?index=true
    • https://s3.amazonaws.com/mogedozara/rumopuvabojufofigipi.pdf
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_26fe25595edb4c1599fe11e90501cb35.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ce.bin
1a3779ad68672e7030b5e4b2c9db8d647ef3da0fcb034f1b23f9053e748812b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 5140 bytes
font_01_sfnt_off0000f71c.bin
207617c155a9cca71f41028a3ece873f165b0a905a0c2f14064ab6f400672512		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10784 bytes
font_02_sfnt_off00011c08.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 4324 bytes

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