Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cb0fe1e291fd98…

MALICIOUS

PDF

76.4 KB Created: 2021-02-16 04:29:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7377f722ce94141372d26fab3f0812bf SHA-1: b5b4a147ba7d052bfb032710bd7346a73c67a1ea SHA-256: f2cb0fe1e291fd981dabf30ba7f11fba7c93b2a3deee9f4bf4c6b78647aeb8f1
254 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or SEO link farms designed to phish users or distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=which+word+describes+the+summer+soldier+and+sunshine+patriot+group+of+answer+choices In PDF document text
    • http://latencfsrt.space/21076028365ozf9t.pdfIn PDF document text
    • http://strita.space/66364051762hj7e7.pdfIn PDF document text
    • http://banolapisa.iblogger.org/giwerogedafarobute.pdfIn PDF document text
    • http://hookup153.site/kid_in_a_sandbox_full_videoanvl9.pdfIn PDF document text
    • http://beststudent.fun/marble_solitaire_easy_solutiono0nf1.pdfIn PDF document text
    • http://bezugunafagomup.22web.org/lagofuvisibusesu.pdfIn PDF document text
    • http://rimka.xyz/tomojepufujqs6fq.pdfIn PDF document text
    • http://verifedform.com/t_shirt_template_front_and_back_illustratorafy05.pdfIn PDF document text
    • https://mobonojijokatu.weebly.com/uploads/1/3/4/3/134320628/745484.pdfIn PDF document text
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/4652325.pdfIn PDF document text
    • http://rumukisizupew.iblogger.org/wawir.pdfIn PDF document text
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/tuxowibenud.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
    • https://s3.amazonaws.com/sirilagewuga/apic-_em_1._6_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/44131715219.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/crash_bandicoot_ps4_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/kilokudax.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/metformin_starting_dose_pcos.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/unity_video_player_not_working_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/lofedozoleles.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/26016184184.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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 5696 bytes
SHA-256: 280e2df486e3880ff01ab9eddd0ad570efb442f9da5193709a9f3eb87c6bd3f9
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 10276 bytes
SHA-256: d12ca16cfcfaa4994a7eabebd26b05133dcdb37fa4f667766ae78656e693371f
font_02_sfnt_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e