Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc61a4a2db2cca1…

MALICIOUS

PDF

75.6 KB Created: 2021-03-02 15:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10266145ce4f3348db4b86d2de44ea45 SHA-1: aa4cb2dbcd53221c2f0865ce7ea3b9f20c8b690e SHA-256: dbc61a4a2db2cca1ca9b58c78302c9aa603bfc6cddf7ebae34bcfcb20f9b1f58
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xajibur.ru/123?utm_term=metal+gear+solid+v+the+phantom+pain+mods+xbox+360 PDF link annotation
    • https://tazesarazuf.weebly.com/uploads/1/3/4/7/134726557/liwosusaterakuxufel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_603d9883d59b0.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/volvo_xc90_shop_manual.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/girl_scout_yells_and_cheers_english_lyrics.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/intellifax_2840_not_receiving_faxes.pdfIn PDF document text
    • https://gapikedezasede.weebly.com/uploads/1/3/1/4/131438622/nulinonavuwu.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/tudetivelir.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/2184913.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/ragaxawunoligogep.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/41022633211.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dumupa/93442564233.pdfIn PDF document text
    • http://rapevuf.epizy.com/79770908274.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/fields_of_gold_choral_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/pisurobujeda.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/resume_template_word_free_2019.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_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 6104 bytes
SHA-256: fca4bff868005b95c5146bd6f403a45a560f1719e26a27c8cc1af11beec3dba5
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 11068 bytes
SHA-256: 24fef803df092c471b2f2637ab7406bdda163dfa0fcf2190799e9ee2c768eda4

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