Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1307b16daf539d8…

MALICIOUS

PDF

100.5 KB Created: 2021-04-19 06:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1778b1e2cb6d1cda2a79bd99f00a6dbc SHA-1: bdb832049626a1ade3bee3d06372f5ffc5369dd5 SHA-256: e1307b16daf539d8dbd55faad19c6811cbd94751cb0750e4bb2599af9703b39e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=machine+learning+course+for+beginners+on+coursera PDF link annotation
    • https://cdn.sqhk.co/moserusoba/dhiheii/senior_pilot_s_flight_logbook_and_record.pdfIn PDF document text
    • http://detonic-italia.website/relentless_tim_grover_downloadlelo1.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/how_to_uninstall_rosetta_stone_completelyet1by.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/bF51Q7E/23253134078.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/ulgjKje/1913292040.pdfIn PDF document text
    • http://axecheat1.xyz/how_to_uninstall_factorytalk_view_studio_v10q52px.pdfIn PDF document text
    • http://tehnikator.ru/jivurimabigim1ch3.pdfIn PDF document text
    • https://cdn.sqhk.co/lazaxosu/whMbjch/61437479413.pdfIn PDF document text
    • http://profapp.pro/pearson_grade_4_math_workbook7dki6.pdfIn PDF document text
    • http://itclick.pro/canon_rc-6_wireless_remote_manualmcfb8.pdfIn PDF document text
    • https://cdn.sqhk.co/gonuromabime/jbBnohg/voguwobiwu.pdfIn PDF document text
    • http://fb-ig-violation.com/1768846318k07wt.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/polojuliragam/respiratory_system_parts_functions_worksheets.pdfIn PDF document text
    • http://sanofuwero.epizy.com/tintern_abbey_line_by_line_summary.pdfIn PDF document text
    • http://zarilapaserit.rf.gd/12849211274.pdfIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_be5ecc3ab07d426680857fedee2751f1.pdf?index=trueIn PDF document text
    • http://buvumitibeve.rf.gd/xitojeboxu.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/astronomia_tony_igy_song.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_85f594c1947646ce97124fd11f9ec374.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000143ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AB 5288 bytes
SHA-256: 9158d5120184a1e34a9eebb53861b79f7824f9aa1826669bacbe33ee5278be31
font_01_sfnt_off000155aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AA 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00015e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E38 11268 bytes
SHA-256: c4e9e1deb81b061746397375caa6c8c8bbf6d24ce145ce29c5d14d2798b5b203

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