Malicious PDF — malware analysis report

Static analysis result for SHA-256 df73cfe8271cde2f…

MALICIOUS

PDF

79.9 KB Created: 2021-04-20 14:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 67964602d88626e7913f16242d5abac1 SHA-1: 95cd96bf205d1228951324bc8b85e0c41e5a728c SHA-256: df73cfe8271cde2fdce71330fbf4648ba1b8a298bba1f206e3682d7346fa6f1a
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=what+is+a+literature+review+research+paper In PDF document text
    • https://cdn.sqhk.co/momujolo/ibV2Bgj/30642849664.pdfIn PDF document text
    • https://todukikezigegu.weebly.com/uploads/1/3/4/3/134359798/9244823.pdfIn PDF document text
    • http://tugalakalat.22web.org/kuwujudavo.pdfIn PDF document text
    • https://lokudepapina.weebly.com/uploads/1/3/5/3/135325929/soxojixamegenom.pdfIn PDF document text
    • https://makirogu.weebly.com/uploads/1/3/0/9/130969002/822c1a412c1c9.pdfIn PDF document text
    • http://rawenspant.online/mastering_manga_3_power_up_with_mark_crilley_download4jbuc.pdfIn PDF document text
    • http://goproits.com/the_taming_of_the_shrew_character_mapekr9l.pdfIn PDF document text
    • https://jotudopu.weebly.com/uploads/1/3/5/3/135316217/lunixuxoxamaxatu.pdfIn PDF document text
    • https://bemafaparad.weebly.com/uploads/1/3/2/6/132681832/kavitilopegamejo.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/NhdtifE/fuzituga.pdfIn PDF document text
    • http://item-mask.top/58537161912rqmjx.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelofid/sjbv37t/dekugipuwizagag.pdfIn PDF document text
    • http://lotto-investclub.com/masked_singer_monster_performance_episode_9d3dwc.pdfIn PDF document text
    • https://cdn.sqhk.co/dedikifefisu/ZhfSiee/78095679712.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/pivetuzadujo/basic_technical_mathematics_with_calculus_si_version_pkg_ed_11.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/how_to_pair_jlab_earbuds_air.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/94973461260.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/gebok.pdfIn PDF document text
    • http://pajamubo.rf.gd/install_python_3.7_and_pip.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/screencap_video_android.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/fogifagutazimizikuwote.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/how_long_to_cook_sweet_potatoes_at_400_degrees.pdfIn PDF document text
    • http://kadusuru.rf.gd/vuwemedup.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_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 5184 bytes
SHA-256: 7901d03a89017f8a1938296ed3e6d21eb71552cb54211314bb2c3738ec9a4f7e
font_01_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 10840 bytes
SHA-256: 202af38fb8aaf88ca5d5ed263f0bb61a695a4483756e3a19bbe0c7c98d8aea4f

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