Malicious PDF — malware analysis report

Static analysis result for SHA-256 235a156d793522b5…

MALICIOUS

PDF

80.9 KB Created: 2021-02-18 00:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4daac614acdfc0a83093f0e4330962ba SHA-1: 749f189064f4597f5798a7a7b42c89f77110c2b4 SHA-256: 235a156d793522b5eeedf36cec76a9f69b2688403916af97bd5d32b3ae98208d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=como+aprender+ingles+gratis+app PDF link annotation
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/2f1fce854ba3.pdfIn PDF document text
    • http://milanomoda.site/mukexiy9s1e.pdfIn PDF document text
    • https://mujilaku.weebly.com/uploads/1/3/4/3/134389228/992257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_60189f2f60d1d.pdfIn PDF document text
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/nasunurumo.pdfIn PDF document text
    • http://firstreadersclub.com/638472845472tw6q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445745/normal_60273055a113f.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/tera_gathering_guide_2018ydve0.pdfIn PDF document text
    • http://site-shop.xyz/college_pore_ek_maiya_mp3_songjui16.pdfIn PDF document text
    • http://omshop.space/adobe_acrobat_pro_dc_serial_number_listl6i11.pdfIn PDF document text
    • https://jasemoluzisad.weebly.com/uploads/1/3/5/9/135968146/9753597.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/8454993.pdfIn PDF document text
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/3457211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_600d292b91677.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/judipinadurakeka.pdfIn PDF document text
    • http://fruits-summer.fun/waviwawogoxamajibumavotuzw3ojg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_602c9eb3f1355.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 5184 bytes
SHA-256: 62c6c9bbe5a09cfb856aca7575be88f831d7d14cb164aad4d444ccbc3b64661b
font_01_sfnt_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 11436 bytes
SHA-256: f3e4c8a671dc261ee1536777022db66d3bc7949edce7dfda8cc64b24ca34da45
font_02_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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