Malicious PDF — malware analysis report

Static analysis result for SHA-256 775911469ad865f7…

MALICIOUS

PDF

65.8 KB Created: 2021-01-15 04:36:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc5ffb582d7de4c1d3f7f38a053d495c SHA-1: da23b8e5c948ca297d41ce3fc5dd68de394288c9 SHA-256: 775911469ad865f76e2c4518d39960cc3bc5e1490216319a3f08c4039e019017
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files. One of these links redirects to a known malicious domain, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file, likely intended to distribute further malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/aws?utm_term=flannel+fitted+sheet+deep+pocket
    • https://site-1178192.mozfiles.com/files/1178192/photo_hair_color_changer_app.pdf
    • https://site-1212417.mozfiles.com/files/1212417/pefim.pdf
    • https://bululirujoko.weebly.com/uploads/1/3/4/4/134487270/fapagugud.pdf
    • https://site-1248967.mozfiles.com/files/1248967/america_s_got_talent_winning_performance_2019.pdf
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/9950723.pdf
    • https://site-1168115.mozfiles.com/files/1168115/red_ball_forever_2_unblocked.pdf
    • https://site-1172346.mozfiles.com/files/1172346/monthly_calendar_september_2019_template.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/volisilitij_luperodebif_vaxulaxolirid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wupagivoz/99554996635.pdf
    • https://s3.amazonaws.com/polexebuj/madediziz.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/yesterday_movie_imdb_parents_guide.pdf
    • https://s3.amazonaws.com/ninasivol/4liker_old_apk.pdf
    • https://s3.amazonaws.com/paropabaru/5549085263.pdf
    • https://s3.amazonaws.com/rufonali/64351833238.pdf
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b46b.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB46B 6744 bytes
font_01_sfnt_off0000c552.bin
b183e93b6cef17201191fa9ff71bcc94ba17915a452883ccce92ee5b8c30db02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 5164 bytes
font_02_sfnt_off0000d6f1.bin
c2f3fe3973dcc4d232acce03cb57a9d213519a984591f5d76f0f37bc658c24de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 9736 bytes

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