PDF malware analysis — malicious · c304256d5abfae79

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 21:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25

MD5: b2f2eb56a6d90006fc1154787246f1a6 SHA-1: c7fbc37d293ce55c27fdce8fd8d39d0ca81498ce SHA-256: c304256d5abfae79bd0946f89926309641d8bd50c4bf19cc496966457ac4ee37

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs, with one specifically pointing to a URL that appears to be a download lure for 'subway surfers download for apk'. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of numerous distinct hosts and links suggests a link farm designed to distribute malware or lead to phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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 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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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/uplcv?utm_term=subway+surfers+download+for+apk PDF link annotation
- http://www.la-rocca.pl/app/webroot/files/files/71477503488.pdfIn PDF document text
- http://www.mediagrand.hu/data/editorfile/80725303082.pdfIn PDF document text
- http://netart.hu/userfiles/file/sijafekapinidatebofu.pdfIn PDF document text
- https://locktactyuma.com/ckfinder/userfiles/files/jidonagetun.pdfIn PDF document text
- http://okun.su/upload/file/kesulasewef.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8975a53e---62983144773.pdfIn PDF document text
- https://farmacieitaliane.com/documenti/file/tinewosilosiwikonirowoduz.pdfIn PDF document text
- http://maschimaurizio.it/userfiles/files/56615747394.pdfIn PDF document text
- http://2446665a.ru/ckfinder/userfiles/files/varulalusu.pdfIn PDF document text
- http://ogledalata.bg/uploads/pages/files/garuzew.pdfIn PDF document text
- http://www.buildonhope.org/file/53500326101.pdfIn PDF document text
- http://symbioticlifetech.org/attfile/fckimg/file///2021090852657_1038316015.pdfIn PDF document text
- http://berallebags.com/UploadFiles/FCKeditor/20210903030530.pdfIn PDF document text
- https://sabresources.com/FCKuploads/file/tawozamifiras.pdfIn PDF document text
- https://windfreeklima.com/upload/ckfinder/files/balun.pdfIn PDF document text
- http://geredekombiservisi.com/userfiles/file/jegowuniwi.pdfIn PDF document text
- http://polyacer-ecp.com/userfiles/files/20210905_203149.pdfIn PDF document text
- http://karinameal.ru/imgdish/files/72310047550.pdfIn PDF document text
- https://hatinhjobs.com/upload/files/17170032449.pdfIn PDF document text
- https://thefertilizerproductionline.com/d/files/mosedoxipumeropidej.pdfIn PDF document text
- http://tourister.kr/userfiles/file/duzukafesaxezemi.pdfIn PDF document text
- http://st-ark.it/userfiles/files/99788194212.pdfIn PDF document text
- http://gps-ambroisie.com/ressource/site-image/files/59909172536.pdfIn PDF document text
- https://mimpisiluman.com/contents/files/lekakupenanises.pdfIn PDF document text
- https://servingltda.com/userfiles/file/90239707980.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d961.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD961	10908 bytes
SHA-256: `3215c04b1116a26b918d7e6711ea57e194cdfc6acd1c592543a3f973f19e516f`
`font_01_sfnt_off0000f296.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF296	17040 bytes
SHA-256: `919f289764c9f403679168765eda1ca6f8126d7b403228f0b78d1ac07ee39587`
`font_02_sfnt_off00011e6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E6B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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