Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d77aa40ad71c779…

MALICIOUS

PDF

96.7 KB Created: 2021-03-15 03:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37d47c788cb730bd44035be160d3c16b SHA-1: 14bc4b5b948209e3a9e9a882f1742e210912e3aa SHA-256: 2d77aa40ad71c7795c47bf15f109e1229bf994acd5b14dcbc882dd4f030b8a7f
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external links, with a significant number pointing to a link farm, suggesting a phishing or malware distribution attempt. The PDF_SEO_LINK_FARM heuristic indicates a large number of external PDF links, likely intended to redirect users to malicious content. The presence of embedded URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=acid+base+chemistry+10th+notes+pdf
    • https://nebegixemavo.weebly.com/uploads/1/3/4/3/134359619/virurusonu.pdf
    • https://cdn.sqhk.co/gewewoturila/clhi3ia/youtube_videos_not_playing_chrome.pdf
    • https://cdn.sqhk.co/bikakigiben/avXLXjg/guxigizadel.pdf
    • https://judezirebesos.weebly.com/uploads/1/3/4/6/134669344/vijatowujunanel.pdf
    • https://moxitamun.weebly.com/uploads/1/3/4/0/134040854/827648698e35.pdf
    • https://cdn.sqhk.co/mapetidul/haLhgL2/sugugivipeziz.pdf
    • https://foxogitasi.weebly.com/uploads/1/3/2/7/132740511/lesatezokajiwitu.pdf
    • https://pafolerasakuj.weebly.com/uploads/1/3/1/4/131438226/7679212.pdf
    • https://cdn.sqhk.co/guwuweri/lhbrggY/luno_bitcoin_wallet_app_download_for_pc.pdf
    • https://cdn.sqhk.co/fowipovoji/aXhepSA/free_music_videos_apple_tv.pdf
    • http://begdas.space/rockola_jukebox_model_429kquvt.pdf
    • http://fragcups.com/do_graco_bases_expirev00q2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_02d0f1c7b8864dfe8088582b5377ed8e.pdf?index=true
    • https://49d0234c-aae4-472d-9cb9-6192e9e03354.filesusr.com/ugd/a63595_70ba2a3208074368812cf21c3c2d43c8.pdf?index=true
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_6529e9bd557c488ba03d5d3ec105d5db.pdf?index=true
    • http://rotigenoxa.epizy.com/rapuwaminiregi.pdf
    • http://jumazimedu.rf.gd/72899836828.pdf
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_2ac9f1e62dde4481aa4f43f5477c0ecb.pdf?index=true
    • https://s3.amazonaws.com/vibuvomomuv/tangled_before_ever_after_free.pdf
    • http://wutodabegaf.epizy.com/jemoremu.pdf
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_c6ad381b4b3f4f7eb29e06dd0e614221.pdf?index=true
    • https://s3.amazonaws.com/vavapekadoliti/pexavawowu.pdf
    • https://s3.amazonaws.com/juduk/potivipudepuko.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001109c.bin
d83e330388675550f04341f5594315fba05065449f8c2361b360f3ba6b4c503a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 6804 bytes
font_01_sfnt_off000121d5.bin
657a1ff33ea5e04a79401d289c072fdbe1893236ae0214495e7e6235b8c67a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 5788 bytes
font_02_sfnt_off00013568.bin
b00aea5eda97e9522c6ced9095697b11f4524d1b3facd59b2e7c8cc634920e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13568 11212 bytes
font_03_sfnt_off00015bb7.bin
eca83ba0c726b96b99a8a767537d46a242cbf573efb99f09ffd941e2211c2eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB7 16492 bytes

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