Malicious PDF — malware analysis report

Static analysis result for SHA-256 53aa976312d71c8d…

MALICIOUS

PDF

88.7 KB Created: 2021-03-18 06:20:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5aed7be4d5cdddfc67d19ba23fc90ce1 SHA-1: 9709cbc7ce5cc8a160ef1da317292b994664e500 SHA-256: 53aa976312d71c8d313e9be1ae07cde75c83b7b84827910cd95fff6e84e84a8f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics further confirm the malicious nature of the file. The embedded URLs suggest an attempt to redirect users to external sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://golowaki.ru/wix?keyword=kodi+apk+15.2+android
    • http://zodoworusa.22web.org/gexilisizunikos.pdf
    • https://zukezima.weebly.com/uploads/1/3/4/3/134345014/ea0633.pdf
    • https://golajowedobaxa.weebly.com/uploads/1/3/4/3/134308052/bakekojun_vidurenajawudu.pdf
    • http://dawavuwera.22web.org/cartoon_love_song_hd_video.pdf
    • https://fopudodesesiwen.weebly.com/uploads/1/3/4/3/134344932/3005814.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xetasif/96752676109.pdf
    • https://0a38098d-26c8-4844-ab0b-2dfc398d7f8d.filesusr.com/ugd/fffd55_33651430d31d41219a3ac80dafe72764.pdf?index=true
    • https://uploads.strikinglycdn.com/files/458807e7-cdca-45eb-87d4-2a80f1c65ce1/kenmore_glass_top_stove_instructions.pdf
    • https://uploads.strikinglycdn.com/files/ed67be05-9ec7-4350-82f6-6c586b565cb6/jetewilefufe.pdf
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_a09add15b2064ed6b56c882365144ff0.pdf?index=true
    • https://s3.amazonaws.com/besafefaf/business_information_systems_degree_jobs.pdf
    • https://s3.amazonaws.com/tetenifeme/physics_list_of_definitions.pdf
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_87ec53e09eec43d6af529818608f6e19.pdf?index=true
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_04bfef01e89540a6a8bc75321de4d214.pdf?index=true
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_f2b5abb1386e4fb08a2e0d5fbac71573.pdf?index=true
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_b7ca86dd8b594726ac969c18da1c903c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/83c674e8-9489-486f-b722-3eb27e8ec21a/pabumuba.pdf
    • http://vufigenetusanu.epizy.com/lichen_sclerosus_treatment_guidelines.pdf
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_9878be1f904c4a6d8c4418064068f03a.pdf?index=true
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_b19ec2f2bdaf4fb196838c3bd7767420.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f525eefc-10a5-4328-865d-6076049cd017/pixole.pdf
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_8bdfe623be5f4d1da79e63d9e1d5b41d.pdf?index=true
    • https://s3.amazonaws.com/mipeboro/74589962169.pdf
    • https://uploads.strikinglycdn.com/files/acb60b0e-dc62-4118-b2e0-65249edd6c11/gisosobafota.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103dd.bin
5decb8acd65792d61a81d1dd707a412974e578068fcd5499dac8e1d6c6e4cc11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 4704 bytes
font_01_sfnt_off000113e1.bin
5795b082bae4d1bbf1aad6185f87887d9e03ffd5fdda0feab7e8896eff43a837		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E1 22824 bytes
font_02_sfnt_off000146db.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146DB 4324 bytes

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