Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5fdfed5a38a1082…

MALICIOUS

PDF

92.3 KB Created: 2021-04-13 01:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ec1f0e13694900a7e74572ba7e2c9de SHA-1: 1e90d0ae598306752eaf5d135213880061c41060 SHA-256: a5fdfed5a38a10824f1c870da5646f0dae7ac282fd95fc06b2fa829055cd9fbd
156 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, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to malicious content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs indicate a phishing or redirection attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=poetic+ways+to+describe+sunrise+and+sunset
    • https://cdn-cms.f-static.net/uploads/4412583/normal_6016f419ee619.pdf
    • https://wojizenufojanog.weebly.com/uploads/1/3/4/7/134724603/180b41.pdf
    • https://cdn-cms.f-static.net/uploads/4420775/normal_600dc6e462eb6.pdf
    • https://wagofokixe.weebly.com/uploads/1/3/4/6/134694124/raxiw-pikobexur-pirubojigupite-dunesejovidunu.pdf
    • https://static.s123-cdn-static.com/uploads/4408186/normal_5ff70b041df28.pdf
    • http://urro-hu.com/how_to_fix_no_dial_tone_on_all_phones_issuejkp2n.pdf
    • https://sezivokup.weebly.com/uploads/1/3/5/3/135318733/89857860a5.pdf
    • https://roviselazadavuw.weebly.com/uploads/1/3/4/0/134040559/vesinizosipox-raguzidane-jolatev.pdf
    • https://lozuninusagutog.weebly.com/uploads/1/3/5/3/135309735/lebadekudumanurekala.pdf
    • http://fastgetme.online/a_christmas_carol_fx_release_datewsizi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/putelekireza/35077891222.pdf
    • https://s3.amazonaws.com/kakekojezutok/free_english_worksheets_6th_grade.pdf
    • http://ninotabud.epizy.com/st_benedict_rule.pdf
    • https://s3.amazonaws.com/nefunupu/ecological_economics_an_introduction.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/50045812590.pdf
    • https://s3.amazonaws.com/timeziso/31184380361.pdf
    • http://navamobatetipo.rf.gd/what_is_visual_aids_in_simple_words.pdf
    • https://s3.amazonaws.com/bulikowexunepov/android_studio_machine_learning.pdf
    • https://s3.amazonaws.com/tezofuretejom/c._v._t._s_full_form.pdf
    • https://s3.amazonaws.com/tawovojo/search_files_on_google_drive.pdf
    • https://s3.amazonaws.com/vofadoloves/84449658233.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d24.bin
e8f1a0b91133cde93727e458b88698553524459796f7ec374253275a7a9606e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D24 5236 bytes
font_01_sfnt_off00013f13.bin
6d4c1ded32ec56fa928fab3cf39b3bf63b80c833bed97895cbf39761fea8f440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F13 10980 bytes

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