Malicious PDF — malware analysis report

Static analysis result for SHA-256 824cc436a7c4f57b…

MALICIOUS

PDF

76.4 KB Created: 2021-03-13 21:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b9fdc75a76245abc559af67eac5208 SHA-1: 83dbe3bc301cd3b0c8a1ec23e54fec678e2aa12b SHA-256: 824cc436a7c4f57b3801764bd33d40a03b41d4ca52f884935ca4f5f652614165
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to unknown or potentially malicious domains, suggesting a link farm or redirection mechanism. The document's content, though garbled, suggests a lure related to a study guide, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=maryland+dental+jurisprudence+exam+study+guide
    • https://tetalopen.weebly.com/uploads/1/3/1/8/131857308/bafevojig.pdf
    • http://springwin.space/tobelemebavolo14keb.pdf
    • https://fulotetaputu.weebly.com/uploads/1/3/2/7/132740707/fb4ce76aed7.pdf
    • http://logmeinnow.xyz/kezunjptx6.pdf
    • https://pabebubi.weebly.com/uploads/1/3/2/6/132695301/d3ead6.pdf
    • http://xebiniseba.mygamesonline.org/hungry_caterpillar_printables.pdf
    • https://kibibobufusasi.weebly.com/uploads/1/3/4/6/134643218/dopiseri.pdf
    • https://gefawopunov.weebly.com/uploads/1/3/0/9/130969454/denerazolusemilo.pdf
    • http://tezuveripoxub.mypressonline.com/oxidation_reduction_reaction_examples.pdf
    • https://lafitezin.weebly.com/uploads/1/3/5/3/135323108/3283679.pdf
    • https://health.m
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5e346889-6f69-4086-9a4e-c5d09c07bea5/ginifomepixax.pdf
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_d1f833e9e53f41ffa24fc5334a40c011.pdf?index=true
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_8fcad5cd249a4fbeb8767b5c17a5f1c2.pdf?index=true
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_63b0d09736fb493aa5d9dee5ff2ac78f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6011f5dc-1edf-48aa-8660-9e73161c98ad/focusrite_scarlett_2i2_1st_gen_vs_2nd_gen_vs_3rd_gen.pdf
    • https://uploads.strikinglycdn.com/files/6d8351d5-d798-4d8a-a467-246bacf18bb1/diversity_equity_and_inclusion_statement_example.pdf
    • https://uploads.strikinglycdn.com/files/89736eb4-5233-4df3-bdf5-1ca9d6786789/gukapumewirovef.pdf
    • https://uploads.strikinglycdn.com/files/3ecbca0b-c891-455d-bb01-663e9e4457a6/zowuragunojofusiwojin.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_off0000ea70.bin
4a1413d809879deb5c6b53a09fe5a0c1117a4b5c98d26dcce69026b4e0887fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 5644 bytes
font_01_sfnt_off0000fdb6.bin
38ff118c4b6cc2b5d40fa555eef38bb6b8c44b74bad5778044cc884a9ffd6a09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 11296 bytes

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