Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e8cca022981e13…

MALICIOUS

PDF

65.1 KB Created: 2021-01-15 05:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0c5e2e4854291bbec7955c1cf4187f94 SHA-1: 4ea2bc8bce9caf21e850336c140a85c0c12a4f66 SHA-256: a3e8cca022981e1339c73b894c9982a51a1441db965ffa78a2f80acf69665d50
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'essay writing', likely to trick users into clicking the malicious links. The presence of a link farm on disposable hosting further supports a phishing or malicious redirection intent.

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
  • 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 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://ggtraff.ru/123?utm_term=essay+writing+textbook+pdf In PDF document text
    • https://site-1174025.mozfiles.com/files/1174025/63121999294.pdfIn PDF document text
    • https://site-1177736.mozfiles.com/files/1177736/green_bean_casserole_with_bacon_and_fried_shallots.pdfIn PDF document text
    • https://site-1168034.mozfiles.com/files/1168034/llama_spit_spit_android_1.pdfIn PDF document text
    • https://site-1171718.mozfiles.com/files/1171718/20964499153.pdfIn PDF document text
    • https://site-1168169.mozfiles.com/files/1168169/droid_circuit_calc_pro_apk_download.pdfIn PDF document text
    • https://site-1217839.mozfiles.com/files/1217839/android_9_black_theme.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/PibjhT4/fagiperowife.pdfIn PDF document text
    • https://site-1182116.mozfiles.com/files/1182116/studentbeans_discount_code.pdfIn PDF document text
    • https://site-1178709.mozfiles.com/files/1178709/64204267598.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/hga0xHO/makixeloxikuxujibitis.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/fobupojowojon/blank_chatterbox_template_printable.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC024 5600 bytes
SHA-256: 88d8244e491ec5dce858c10eeca7b7de22cfe950e49f2b2ff3e036a2e62b5454
font_01_sfnt_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 11244 bytes
SHA-256: ec2aeda8cf468449f83189be82a8aaeb794a1b59a0a2df530ffbd688354033b1

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