Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da4a11836a88958…

MALICIOUS

PDF

76.2 KB Created: 2021-04-08 03:39:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c7dbe6df2c9d637f91c6c116a134b41 SHA-1: caeab5202dc83166746ec84673af0e65c4397128 SHA-256: 1da4a11836a88958c63363b57f6aa15a558264718c5a86029ac30a95fee708f0
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm and a high-severity heuristic flagging an image lure linking to an SEO redirector. The primary malicious URL identified is https://maypoin.ru/123?utm_term=leopard+gecko+care+guide+petsmart, which is likely used for phishing or to download a second-stage payload. ClamAV also detected this file as Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=leopard+gecko+care+guide+petsmart PDF link annotation
    • https://cdn.sqhk.co/lomasamube/Hhfkhhb/crash_test_car_racing_point.pdfIn PDF document text
    • https://xuredetinumimo.weebly.com/uploads/1/3/4/6/134630251/tewomugi-mujogasapodofoj-wufoxixa.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/njgihgd/age_of_empire_apk_offline_game.pdfIn PDF document text
    • https://nimekeboxiz.weebly.com/uploads/1/3/0/8/130873861/868235ca77fd2cb.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuvegox/iEjhFjc/ligovol.pdfIn PDF document text
    • https://cdn.sqhk.co/filovixedalu/3jj9gjk/pawuzofepuzita.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/qsEzNgj/66216552459.pdfIn PDF document text
    • https://duvefotod.weebly.com/uploads/1/3/1/3/131380754/takepuxobikixegusupa.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/wemazun/12121140716.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/2079295072.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/bleacher_report_mma.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/jenikowazefi.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/neoprene_gloves_chemical_resistance_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/53742715734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a1f056-997e-4fe3-89a2-324483e51b01/1181270675.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_20b1552de5e2415eb1ff784df44de63c.pdf?index=trueIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_7ea864c122be4fc683a8d0e7d5f7976e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/82152010245.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/34357674345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42390cf7-67b8-4a82-a262-d4b1525a8e0c/6830116106.pdfIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_3468bb0f295a48bcbf2f16512f25b2c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/berthold_akzidenz_grotesk_italic_free.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_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 5364 bytes
SHA-256: 0a3bcdf851d4b1f9358005efa3f6089637b3a9ac9e9f9df661ab662eab681d4e
font_01_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 11040 bytes
SHA-256: 2dbca40ac549d7025f522e525844b939898380ab31c57e97c80f7ada1e5c2b34