PDF malware analysis — malicious · 1a5f6faa8715ddfb

MALICIOUS

PDF

71.9 KB Created: 2021-02-14 18:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 257e4e7134fc83479de60248ad52ae8a SHA-1: b59a0ecda8e8a6b99b71275527a3cb96a6849951 SHA-256: 1a5f6faa8715ddfb1f309e89e0d14dc336dd4d3e2d2f4cf4c136d933256343db

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, with a primary redirector URL pointing to 'https://jottigo.ru/wix?keyword=shelby+middle+school+phone+number', disguised as a search result. The document body, though heavily obfuscated, suggests a lure related to a school phone number, aligning with phishing tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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
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/wix?keyword=shelby+middle+school+phone+number PDF link annotation
- https://cdn-cms.f-static.net/uploads/4501965/normal_60238859c6ab8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475985/normal_5fd622ae44e6c.pdfIn PDF document text
- https://fawesilabe.weebly.com/uploads/1/3/2/6/132680990/nuxemala.pdfIn PDF document text
- https://zumizosapozogem.weebly.com/uploads/1/3/2/6/132681504/36b38.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4391319/normal_5ff4c6295b267.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4480142/normal_600077ec09397.pdfIn PDF document text
- https://cdn.sqhk.co/zuxolusufa/PLjcgi4/houseparty_black_and_white_icon.pdfIn PDF document text
- https://cdn.sqhk.co/nutewakizi/jghgfgj/29173970429.pdfIn PDF document text
- https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/bawixumujilalulutaf.pdfIn PDF document text
- https://cdn.sqhk.co/tategupet/Vhe25ha/43208061022.pdfIn PDF document text
- https://cdn.sqhk.co/zarepowake/ggvc1SA/gubipexukewapuv.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://s3.amazonaws.com/lixasifasi/37466958449.pdfIn PDF document text
- https://s3.amazonaws.com/xezonijida/spell_check_app.pdfIn PDF document text
- https://s3.amazonaws.com/xuvamuba/aladdin_2019_ost.pdfIn PDF document text
- https://s3.amazonaws.com/sinadi/76413564901.pdfIn PDF document text
- https://s3.amazonaws.com/widiku/70977512745.pdfIn PDF document text
- https://s3.amazonaws.com/mefovu/coolrom_3ds_emulator_android.pdfIn PDF document text
- https://s3.amazonaws.com/kevava/barotse_band_music.pdfIn PDF document text
- https://s3.amazonaws.com/pubopelej/zibegomosixivavofelim.pdfIn PDF document text
- https://s3.amazonaws.com/wujixus/english_grammar_worksheets_for_esl_students.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cf86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCF86	5252 bytes
SHA-256: `14abce588a7402b501ffd5880f4e4529242fd680fca5683ac050f0be83e11299`
`font_01_sfnt_off0000e124.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE124	10208 bytes
SHA-256: `381c46d98d8966a7cb9ac621aaca18243f7611671a300116a1785d2c0ee533a0`
`font_02_sfnt_off00010423.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10423	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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