Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c63bee010a4d99b…

MALICIOUS

PDF

68.6 KB Created: 2021-03-26 08:37:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 13851742ddfa2a00c0d810e3e3f3d32d SHA-1: bc2d60d499d5efbd4feec8566b55e2e2e71d2e89 SHA-256: 4c63bee010a4d99b2bd66137d9822a0ed0c2b6453572d8754f82c2b2a4f9dabd
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a primary redirector pointing to 'https://lozipotod.ru/award?keyword=types+of+computer+applications+pdf'. This URL, combined with heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK', indicates a likely attempt to drive traffic to a malicious site, potentially for phishing or to serve further malware. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://lozipotod.ru/award?keyword=types+of+computer+applications+pdf PDF link annotation
    • https://rominekajamarol.weebly.com/uploads/1/3/4/0/134040464/981717.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/zukamuzejujuvukudinu.pdfIn PDF document text
    • https://lurotafimeka.weebly.com/uploads/1/3/0/7/130740015/rizidopogogif.pdfIn PDF document text
    • https://tasiwusod.weebly.com/uploads/1/3/5/3/135351817/kimojep.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/adc4740.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/fixararololu/88652177999.pdfIn PDF document text
    • http://bubojawafutak.rf.gd/botegetimiwaki.pdfIn PDF document text
    • http://tunufefenus.rf.gd/kufemexibokuguzejup.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/diragujatesilonajad.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/60931297530.pdfIn PDF document text
    • http://mudozegiviw.epizy.com/aaxa_m2_micro_projector_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/97260934173.pdfIn PDF document text
    • http://lapojuvide.epizy.com/56819454191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad5134b3-393e-41ad-9e2a-1208c611e456/what_does_the_song_take_me_church_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73df6b7f-a2f5-4b12-941c-2ede6fc806f8/twitter_search_operators_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/javafx_table_column_number_format.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/multiple_sources_of_income_bob_proctor.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/b_f_g_telugu_movie.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_off0000cf9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 5352 bytes
SHA-256: 8af7ba4e0faf0ce0f3b9c9a17279f6f830e04f36a16c3e88b3925502e25fa2a4
font_01_sfnt_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 10364 bytes
SHA-256: 0421d217dfbd6f9248c0983009cbdee22e1bcd09e9a4189fddde0b79a80da06e

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