Malicious PDF — malware analysis report

Static analysis result for SHA-256 004aaea1819e4916…

MALICIOUS

PDF

90.0 KB Created: 2021-05-21 04:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a104409950659073537d038020564409 SHA-1: 7a4a0618d640bc4e9d39a508be3bf22ea13f6a06 SHA-256: 004aaea1819e4916abb97f389e3b9e27b29fda4056a77ed1d1be51409d412180
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDFs, likely for SEO manipulation or to distribute further malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a coordinated effort to drive traffic or spread malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://midufefew.ru/strik?utm_term=perspectiva+caballera+ejercicios+resueltos+3+eso PDF link annotation
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/vuzajinidepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_6066dca200daf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_6013a39ac2537.pdfIn PDF document text
    • https://mogidudurunupiz.weebly.com/uploads/1/3/2/6/132695636/f0ac35fca83ae38.pdfIn PDF document text
    • https://fexiragija.weebly.com/uploads/1/3/1/4/131409693/baposivesuxasuda.pdfIn PDF document text
    • https://lotuwuwobegeze.weebly.com/uploads/1/3/4/4/134476082/9356644.pdfIn PDF document text
    • https://kepubewi.weebly.com/uploads/1/3/6/0/136095452/vebanugixibiz-netarosopuku-kujotilupid-korefota.pdfIn PDF document text
    • https://namuxewanazojo.weebly.com/uploads/1/3/4/2/134266474/mikavi-bamakitob.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/gewibufage.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/9a07bc3b837e150.pdfIn PDF document text
    • https://tonezukem.weebly.com/uploads/1/3/5/3/135348251/e61327b53e30b4.pdfIn PDF document text
    • https://xaloxegapix.weebly.com/uploads/1/3/4/8/134862860/8941611.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/a545437cbb621e.pdfIn PDF document text
    • https://tebefatudu.weebly.com/uploads/1/3/4/3/134329870/2877827.pdfIn PDF document text
    • https://dugigezulafi.weebly.com/uploads/1/3/4/8/134898894/sasevofonologolivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403952/normal_600ba97156603.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/how_to_put_water_in_a_single_cup_keurig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a713bea5-7f5d-4f06-b657-e2b0e105a1be/lebajagilawogalorafoniw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e747761f-9021-42b2-b6c1-b88f37e37f3e/my_samsung_led_tv_has_no_picture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf9451d-341d-4c46-80d9-962f5b880901/8698419939.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/70150756813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c861c24-50da-4b6d-b961-eeab64d9f562/70427700496.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 1528 bytes
SHA-256: dac4ca97c95db3ffb4d4c2c3c7e66e39e5975192048cd85a1086d13c54190c12
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 5368 bytes
SHA-256: 819abb975be893d8e56aa529b4b7909d8feef4daa54bbaadbe96d55db543b4e0
font_02_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 12560 bytes
SHA-256: 1a233d2fad16aec08a9f7dd79e847f883a4d87ae6bc60c37a19c95f5adfd6fef
font_03_sfnt_off000142a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A3 16060 bytes
SHA-256: 4471f92216f50ed59660dfde07325d7bc7936b356a877ae20405b399f7876638

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