Malicious PDF — malware analysis report

Static analysis result for SHA-256 02469567c32f6a42…

MALICIOUS

PDF

108.4 KB Created: 2021-02-12 16:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cfc9965f9bd8073b71f10b6d81792dbf SHA-1: c3b4670aeb4c7c2ddeaaa1cd66d1f7dcbc8edf72 SHA-256: 02469567c32f6a421390215a0178067c278fc72c0671b5c83b3138f9b7dc8087
136 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, many pointing to SEO-optimized redirectors, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document's primary purpose is to drive traffic to external sites, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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://jottigo.ru/123?utm_term=chinese+fighting+dog+statue PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5fc63e8db2b27.pdfIn PDF document text
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/kufofezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_6014cf1742650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5fdc3c6af3603.pdfIn PDF document text
    • http://fefosawixamuwow.22web.org/9246793829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411944/normal_5fe3b088a655c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/32972648728.pdfIn PDF document text
    • http://nagajawonusagu.epizy.com/latest_bollywood_songs_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/51506870413.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/mitosis_and_meiosis_lab_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/camscanner_for_iphone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/zivet.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/xasabujojokupukiko.pdfIn PDF document text
    • http://sivuvupaxiju.rf.gd/woboge.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/achievement_test_report.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
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f422.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF422 15092 bytes
SHA-256: 142a524251fb141a1fae68a3a8d391adbc2fa58e44e12a142360b8c654147ed3
font_01_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 4944 bytes
SHA-256: a133cb80f354de49a80360cac4a178cda7f6c138901fd68c333e9ae90ec3a2e7
font_02_sfnt_off000134bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BB 9656 bytes
SHA-256: 64db9045bb9dbcc35b5a2325378de37b1c7abbbff17c7c206c7d72642ca8f0b5
font_03_sfnt_off000148ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AB 4712 bytes
SHA-256: 348f29302b11fa095c2157ad545d7ddd114ea5cf8c1c8c8d7e0bf5232354f97a
font_04_sfnt_off0001570f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570F 5248 bytes
SHA-256: f86fbc715cdad6f15da4454a0eddca8b0a152c15435a79c51caa2435d43adcd3
font_05_sfnt_off00016933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16933 13664 bytes
SHA-256: 13f26aa9d025ad5e633f90c508e8dd0ae9d00896d3478c60f7e953b8af6d2a86
font_06_sfnt_off000193aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193AA 4848 bytes
SHA-256: 802d23ad803862203ecc54637289cc63c73c67223b25285a95cba90b528eecae

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