Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac50c53950386839…

MALICIOUS

PDF

79.4 KB Created: 2021-02-26 01:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b7a3b95fca5945ee9c6656e901435f5c SHA-1: 32f33e2e7bde9c1c0334ae8283220cc7cb5002a1 SHA-256: ac50c53950386839435a6bad050b5392079a6d617d7b84bc438b0932909fcc5f
244 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to distribute malicious content. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly suggest a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lead users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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/wix?keyword=texas+instrument+ti-83+plus+manual In PDF document text
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/31b25718ce76a8f.pdfIn PDF document text
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/ranababiwofebus.pdfIn PDF document text
    • https://jasoveloxera.weebly.com/uploads/1/3/5/9/135967924/bovifozolo-weguru.pdfIn PDF document text
    • https://soxagunolipug.weebly.com/uploads/1/3/4/8/134887217/mesivimulesosimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471995/normal_60382a5b04b96.pdfIn PDF document text
    • http://romeital.space/zewosufuvimiscj5yc.pdfIn PDF document text
    • https://kujadivenudeku.weebly.com/uploads/1/3/5/3/135324903/fopujaposutonurefiz.pdfIn PDF document text
    • http://sedovarubabozop.iblogger.org/meleravi.pdfIn PDF document text
    • https://turabebusaweni.weebly.com/uploads/1/3/1/4/131438207/134b450985f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426828/normal_5fc96aae75778.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/vebenok/edittext_border_radius_android.pdfIn PDF document text
    • http://foweroboxufafuv.epizy.com/91734389849.pdfIn PDF document text
    • http://ruxuvejefo.epizy.com/what_is_the_aim_of_cbt.pdfIn PDF document text
    • http://kifugelewepin.epizy.com/breeding_sanctuary_dragon_city_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/jetagike.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/ielts_reading_synonyms_words.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_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 5372 bytes
SHA-256: 20c56d61b2463ff9e30a40e92973915e1a714c02614b2c011ffd5219611ae058
font_01_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 10752 bytes
SHA-256: dd7895197b965186718f1cbcd20610f3a1e8546b487375b1c12f0820604cfaf3

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