Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca257cdf67155ea5…

MALICIOUS

PDF

73.5 KB Created: 2021-02-28 12:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6c26c39db936ad0d75904604cf9c4338 SHA-1: 3140464538d0fd79a9554624dea1bf8efc0b5347 SHA-256: ca257cdf67155ea5269d99ee7a0e7cf1c65cad3e868e2d86c2eff390900c952d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=organic+chemistry+quiz+1+answers PDF link annotation
    • https://gopopozemilin.weebly.com/uploads/1/3/0/8/130874381/firoxafufe-guwimiw-mibukonofit.pdfIn PDF document text
    • http://ekzo-fruit.ru/46747908003uajqv.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/which_samsung_phones_support_wireless_charging.pdfIn PDF document text
    • https://nowawizerazez.weebly.com/uploads/1/3/4/5/134519823/jitetobi-lekisexebabe-zuluva-difodozenodezom.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/8174f67.pdfIn PDF document text
    • https://naxigekaserudo.weebly.com/uploads/1/3/4/6/134644932/ruteg_zukuze_wivaduzobiruxat.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/how_much_do_mechanical_engineers_get_paid_in_australia.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/supupifi.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/9ff397fde6958c.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/46555770152.pdfIn PDF document text
    • https://moraraxewurazi.weebly.com/uploads/1/3/4/0/134042425/1329857.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/how_to_explain_quick_learner.pdfIn PDF document text
    • http://grenkasalo4.xyz/ff14_fieldcraft_demimateria_3_farmpo7c7.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/canon_sx160_battery_charger.pdfIn PDF document text
    • http://feyakast.online/xopuzjby5z.pdfIn PDF document text
    • https://roxuvipiga.weebly.com/uploads/1/3/4/6/134637137/c18f91.pdfIn PDF document text
    • https://gazekusiparisom.weebly.com/uploads/1/3/4/0/134012522/9de966af4a06bbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nukivamo.myartsonline.com/lisogidokipomewalaros.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/31316376287.pdfIn PDF document text
    • http://gosigugul.epizy.com/60845448511.pdfIn PDF document text
    • http://tawuvoj.rf.gd/56011434902.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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 5632 bytes
SHA-256: 38b31f12a277698fe7785daa7f9d85e03e677ed1ee070dea36f6c61dd1837823
font_01_sfnt_off0000f1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FF 11516 bytes
SHA-256: aaae8af8f9fac81a6b609716e0319d3708f2869c6eb38db12004cd0b3fb7cca9

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