Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a42f12ba697984…

MALICIOUS

PDF

75.3 KB Created: 2021-03-25 12:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1896dd025a05b29f7c5250f55616d46f SHA-1: cedd34d6e1445f9fc702c4d4dc750723b4453b7c SHA-256: a7a42f12ba6979849542008514e528449af056ac8de218a91cabc45f2186c4b9
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including ML and ClamAV, as a phishing trojan. It contains an embedded URL that acts as an SEO redirector, likely intended to lure users into downloading further malicious content. The document body appears to be corrupted or obfuscated, preventing a detailed analysis of its specific content, but the presence of the redirector URL strongly suggests a phishing or malware distribution attempt.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://zajinet.ru/strik?utm_term=health+the+basics+13th+edition+free PDF link annotation
    • http://bukatinanebon.22web.org/32982296661.pdfIn PDF document text
    • http://wavolat.iblogger.org/tutatiwibalukarirumil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488137/normal_6005a09980191.pdfIn PDF document text
    • http://sarawavenudiwap.mygamesonline.org/didavoresakitixujonope.pdfIn PDF document text
    • http://mipexalazalekab.getenjoyment.net/bible_stories_in_telugu_download.pdfIn PDF document text
    • http://wunuvuzixuxi.getenjoyment.net/71715243487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_60240ff395420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_5fdbb574da90b.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/gavobawum/vomafirukoxagevuranoneta.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/dodge_challenger_sxt_2016_manual.pdfIn PDF document text
    • http://vavadot.onlinewebshop.net/49130744111.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/cello_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/wrong_side_of_town_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/xaputijigejikaxujozasozi.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/19673876710.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_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 5424 bytes
SHA-256: 3d46c116f0e99b5e5cd79783c52726328ea48b83319c5184dac1634c34eb3172
font_01_sfnt_off0000f7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BF 12292 bytes
SHA-256: 683cf5ed1e7596eecdce3bf873b92c9904617a38754b398320ce18be84f76cb7

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