Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4f6413ef085f05…

MALICIOUS

PDF

78.2 KB Created: 2021-02-21 19:11:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0cda87fcf14a2ec80d6f3e1e0b348612 SHA-1: 060cf056c40296c47a206528ee399b3cc0aba076 SHA-256: fc4f6413ef085f05e5da165050e9ce24892c643480703d0e302ff50ef8216f09
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though truncated and containing artifacts, includes a title related to router usage, which could be a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=how+to+use+wps+button+on+talktalk+router PDF link annotation
    • http://gamedv.design/bose_wave_soundtouch_music_system_reviewfxb3g.pdfIn PDF document text
    • https://zabidikigez.weebly.com/uploads/1/3/4/5/134594795/5995831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452618/normal_6015b66aa4ce7.pdfIn PDF document text
    • http://technodom11.com/81886198533699f1.pdfIn PDF document text
    • https://nizufamira.weebly.com/uploads/1/3/4/3/134310662/725245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5fdac9396ede2.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/kefaxelipubbln.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/bhagavan_baba_songsveba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fd61d5b0be1e.pdfIn PDF document text
    • https://saripubisopa.weebly.com/uploads/1/3/5/3/135322362/341673.pdfIn PDF document text
    • http://mainsale.pro/bouncy_dunk_gamesgfdi2.pdfIn PDF document text
    • http://speak4pro.com/formtec_labels_guidezkrnk.pdfIn PDF document text
    • http://pipvip.ru/doradarolowedivukib1h56s.pdfIn PDF document text
    • http://islemleriniz.org/fovalebumoviwuvurafutanuwzc.pdfIn PDF document text
    • https://rolorizumi.weebly.com/uploads/1/3/4/3/134316308/a8716efeff18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469105/normal_6019591a3acc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dizojid.rf.gd/ethernet_adapter_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A9 4904 bytes
SHA-256: bb2334dfac652d5b39c4787a87f31ecffbdbdd9ce9c08d4e98579db5173c378f
font_01_sfnt_off0000f76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76A 10632 bytes
SHA-256: 37d0a77cf9ad84d22a057f11e893b0347e6255e6193eadfd2367f03259b1c030
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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