Malicious PDF — malware analysis report

Static analysis result for SHA-256 c287e167f36948b4…

MALICIOUS

PDF

107.7 KB Created: 2021-02-11 02:27:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 31ea73c652ad110a7496ba2ecc6cd2c8 SHA-1: 5246ae5a229f542f3a027c9dcd59252eb081e1e3 SHA-256: c287e167f36948b4c3fe85ea14b1847fe90529cff4c4e2c3f1c7d290f0195827
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to technical search terms, suggesting a phishing or scam attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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/wb?keyword=venturi%20scrubber%20design%20calculation%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fd643ef4ab74.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxowowi/BTAjbeH/dead_ahead_zombie_warfare_hack_apk_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421462/normal_6006ea3d5caa7.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/b01b38d9940abb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369168/normal_60012689a47e9.pdfIn PDF document text
    • http://hayatevesigar.online/can_you_ride_the_ender_dragon_on_xbox1rfkf.pdfIn PDF document text
    • http://banque-populaire.best/switch_nintendo_lite_coral2epfc.pdfIn PDF document text
    • http://iceteas.space/xolujajujomivizuzeiqzv9.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/659362.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/mefega.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/timoshenko_theory_of_elasticitysiufh.pdfIn PDF document text
    • http://kushtanash.ru/5277707974zz2w1.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/hkhbeMn/funny_nails_done_meme.pdfIn PDF document text
    • http://geniusenglish.space/bigudosi721gg.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/4739010.pdfIn PDF document text
    • https://cdn.sqhk.co/votojuxosaf/jctOijv/75786055819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_5fe64ae124411.pdfIn PDF document text
    • https://livurexile.weebly.com/uploads/1/3/2/6/132695833/1424556.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405420/normal_5fe473f551f60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 6440 bytes
SHA-256: b12f90119eb72b6e2fce735563d2152593b0778078260eadb32dae27e8664f7d
font_01_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 4876 bytes
SHA-256: 9b7eef0639e8a86fec50bf09d28c2f2092852c994eda1e39d76ffbb4a2c855f2
font_02_sfnt_off00012dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD9 5428 bytes
SHA-256: 4982c8a5d79c889c88c69cc11f0d3f347237016d5eaed7419eab60dbd69dd180
font_03_sfnt_off0001405f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405F 16592 bytes
SHA-256: 7a8c5a6315fc0ad8ad8dc4fe835e0da041591ef2910c883d40f76dca4f1808f0
font_04_sfnt_off000176c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176C7 17024 bytes
SHA-256: 7046f32fd568785af9d92897e71738aa1427be1b6b06c87a6321b7fe61462ec7
font_05_sfnt_off00018f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F51 6504 bytes
SHA-256: 005d333fb4ff56075dd3824a705f0697ea50b1bd7b6b9bff681458874559727d

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