Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecd75ef876ba88d…

MALICIOUS

PDF

76.5 KB Created: 2021-06-02 00:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afcc465a620788aef92e5c18e8c2eb49 SHA-1: 5b95e942d2a0224830c6c6750bf90d02bef46c32 SHA-256: 1ecd75ef876ba88d3f09dcbaafed57078ec12e05e858c3a22a27e7173eed8e6a
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or a similar scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent, likely to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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://irlanc.ru/pbw?utm_term=how+to+level+up+fast+in+bloons+monkey+city
    • https://mujunoba.weebly.com/uploads/1/3/2/6/132682006/sitewisuvavupaju.pdf
    • https://zemexiwo.weebly.com/uploads/1/3/4/3/134321437/b8f5236.pdf
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/4371370.pdf
    • https://pelofaneb.weebly.com/uploads/1/3/4/2/134235527/1375588.pdf
    • https://kubazavazagemu.weebly.com/uploads/1/3/4/4/134464578/feborazud.pdf
    • https://damosekim.weebly.com/uploads/1/3/4/2/134235752/6733292.pdf
    • https://nuwevalixur.weebly.com/uploads/1/3/5/9/135990129/bokob.pdf
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/xifejomijiv-toxibikima.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vowujepojez.pbworks.com/w/file/fetch/144428733/wujebep.pdf
    • https://uploads.strikinglycdn.com/files/58ff4f2c-a2c2-4bb1-b7e9-8b3ff409b372/77226449558.pdf
    • http://zabodovojif.pbworks.com/f/jesus_bleibet_meine_freude_noten_klavier.pdf
    • http://zezimin.pbworks.com/f/70945814974.pdf
    • https://uploads.strikinglycdn.com/files/ca4cdfbd-77ec-4932-91ed-d2ac8755d51c/betivefuporexezejur.pdf
    • https://uploads.strikinglycdn.com/files/620c4b9b-84c5-4b0c-86a3-f4efbc5f1e53/jeep_grand_cherokee_parts_catalog_online.pdf
    • https://uploads.strikinglycdn.com/files/6d64e300-92e3-4b56-bf83-dc658545cf22/gotutodasud.pdf
    • http://ridelox.pbworks.com/w/file/fetch/144474144/naxof.pdf
    • http://natizasex.pbworks.com/w/file/fetch/144419883/geguwebonuzexapirazosul.pdf
    • https://uploads.strikinglycdn.com/files/bac89340-b216-4f01-ba4d-40742419ef81/kenisadikujor.pdf
    • https://uploads.strikinglycdn.com/files/6ab300b9-0b4c-4fe5-9a8e-56706c3c6fa0/logician_premium_profile.pdf
    • http://padimagofo.pbworks.com/w/file/fetch/144480513/32162592540.pdf
    • https://uploads.strikinglycdn.com/files/fb70cc4c-4a42-4234-a4d3-9285e85a56f4/lusejepip.pdf
    • https://uploads.strikinglycdn.com/files/c0961c44-511e-4a81-9a47-e6849c5cbf31/judazogewirira.pdf
    • https://uploads.strikinglycdn.com/files/74c94c48-e11a-49f0-a7bf-88acee6bde78/lopunegorukop.pdf
    • https://uploads.strikinglycdn.com/files/5d807726-a0d0-4234-b8ba-e91b674abf5e/glory_in_death_online.pdf
    • http://vawaguzidatu.pbworks.com/w/file/fetch/144424212/82006588735.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e954.bin
803b73611b9cda93fbeb329741f76dd4d2e43be4f22489e424f790aa94dc21b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 5484 bytes
font_01_sfnt_off0000fc0c.bin
d6a463c62cd181b69a1fe5a574f939f01c6f9b4b277bda24b74d1105149b19ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 12332 bytes

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