Malicious PDF — malware analysis report

Static analysis result for SHA-256 3798c7a4dc660000…

MALICIOUS

PDF

75.8 KB Created: 2021-04-19 14:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b8014718498365f15a56ae417897cb58 SHA-1: c860a57155c0710c8f7d6f929db4ea33200a79bb SHA-256: 3798c7a4dc660000fee8cffe373661950d87cd6ea9260c643d5d7facb69c7e36
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers as malicious. It contains an embedded URI pointing to a suspicious domain, 'midufefew.ru', which is likely used to host malicious content or phishing pages. The PDF structure and embedded links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=how+to+check+transmission+fluid+in+2007+ford+ranger PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404121/normal_605b97f41fe9f.pdfIn PDF document text
    • http://dopatixa.22web.org/zadelag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_602e27bee0f3a.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/43394070908.pdfIn PDF document text
    • http://jebifawulu.mywebcommunity.org/inhibition_of_amyloid__aggregation_in_alzheimer_s_disease.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/89846119660.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/pringles_ring_stem_challenge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420250/normal_60391645e7e2b.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/20086157536.pdfIn PDF document text
    • http://zidujut.22web.org/70773898238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f462cc5f-b28a-4466-b032-483f12f15a8a/how_tall_is_neil_degrasse_tyson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a3eae1-b9cd-4c3a-a0cc-bb67f0e8db6a/vba_excel_word_save_as.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/blackberry_z3_autoloader_10._3._2_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f19cccf-72a1-41ac-8dea-a395220fa34d/72430611399.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/paediatric_hypoglycemia_nice_guidelines.pdfIn PDF document text
    • http://kejufomamikis.epizy.com/92711653375.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/31643144387.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/how_to_get_medical_power_of_attorney_in_indiana.pdfIn PDF document text
    • http://jusopetikikij.onlinewebshop.net/wuzezejovifepubagenuwudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a0f5ef-2508-4b09-8535-d95545f5e4a8/onkyo_tx-8160_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34dd67aa-7edd-43e1-ae2f-cc9601bc8ba0/pizabofup.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 5904 bytes
SHA-256: 582807edd4bb17a3261b752597cc9b40267cb12159ae582c303fc073956f54e9
font_01_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 10792 bytes
SHA-256: 6f6c3278f99c5546be8d39024aea6b3270718663b55b81f01c4e06d33a09ac80

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